System.IO.FileNotFoundException: Could not load assembly “AppName” after update xamarin forms











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I can't rebuild the project and I'm getting this exception after updating to latest Xamarin Forms 3.4.0.1008975 , if I downgrade it to 3.1.0.583944 or lower the exception will gone and I can build successfully.



I've tried to update VS and clean - close - reopen but the problem still there , I also tried to move the project to C:/ but no luck .



Error       The "ResolveLibraryProjectImports" task failed unexpectedly.
System.IO.FileNotFoundException: Could not load assembly 'SouqAlData, Version=0.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
File name: 'SouqAlData.dll'
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName)
at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Extract(DirectoryAssemblyResolver res, ICollection`1 jars, ICollection`1 resolvedResourceDirectories, ICollection`1 resolvedAssetDirectories, ICollection`1 resolvedEnvironments)
at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() SouqAlData.Android


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  • In addition to regular cleaning try deleting the obj and bin folders from all project folders and then try again.
    – Gerald Versluis
    Nov 20 at 15:42










  • Can you add the exception in text format, that makes it easier to copy/paste for referencing and searching?
    – Dominique
    Nov 20 at 15:43










  • Yes i deleted the obj-bin , same result .
    – Khalid Hex
    Nov 20 at 15:57










  • I edited the post ..
    – Khalid Hex
    Nov 20 at 16:00










  • which VS version do you use? Update to 15.9.2 and look if you can build it now.
    – magicandre1981
    Nov 20 at 16:49















up vote
1
down vote

favorite












I can't rebuild the project and I'm getting this exception after updating to latest Xamarin Forms 3.4.0.1008975 , if I downgrade it to 3.1.0.583944 or lower the exception will gone and I can build successfully.



I've tried to update VS and clean - close - reopen but the problem still there , I also tried to move the project to C:/ but no luck .



Error       The "ResolveLibraryProjectImports" task failed unexpectedly.
System.IO.FileNotFoundException: Could not load assembly 'SouqAlData, Version=0.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
File name: 'SouqAlData.dll'
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName)
at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Extract(DirectoryAssemblyResolver res, ICollection`1 jars, ICollection`1 resolvedResourceDirectories, ICollection`1 resolvedAssetDirectories, ICollection`1 resolvedEnvironments)
at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() SouqAlData.Android


enter image description here










share|improve this question
























  • In addition to regular cleaning try deleting the obj and bin folders from all project folders and then try again.
    – Gerald Versluis
    Nov 20 at 15:42










  • Can you add the exception in text format, that makes it easier to copy/paste for referencing and searching?
    – Dominique
    Nov 20 at 15:43










  • Yes i deleted the obj-bin , same result .
    – Khalid Hex
    Nov 20 at 15:57










  • I edited the post ..
    – Khalid Hex
    Nov 20 at 16:00










  • which VS version do you use? Update to 15.9.2 and look if you can build it now.
    – magicandre1981
    Nov 20 at 16:49













up vote
1
down vote

favorite









up vote
1
down vote

favorite











I can't rebuild the project and I'm getting this exception after updating to latest Xamarin Forms 3.4.0.1008975 , if I downgrade it to 3.1.0.583944 or lower the exception will gone and I can build successfully.



I've tried to update VS and clean - close - reopen but the problem still there , I also tried to move the project to C:/ but no luck .



Error       The "ResolveLibraryProjectImports" task failed unexpectedly.
System.IO.FileNotFoundException: Could not load assembly 'SouqAlData, Version=0.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
File name: 'SouqAlData.dll'
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName)
at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Extract(DirectoryAssemblyResolver res, ICollection`1 jars, ICollection`1 resolvedResourceDirectories, ICollection`1 resolvedAssetDirectories, ICollection`1 resolvedEnvironments)
at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() SouqAlData.Android


enter image description here










share|improve this question















I can't rebuild the project and I'm getting this exception after updating to latest Xamarin Forms 3.4.0.1008975 , if I downgrade it to 3.1.0.583944 or lower the exception will gone and I can build successfully.



I've tried to update VS and clean - close - reopen but the problem still there , I also tried to move the project to C:/ but no luck .



Error       The "ResolveLibraryProjectImports" task failed unexpectedly.
System.IO.FileNotFoundException: Could not load assembly 'SouqAlData, Version=0.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
File name: 'SouqAlData.dll'
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName)
at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Extract(DirectoryAssemblyResolver res, ICollection`1 jars, ICollection`1 resolvedResourceDirectories, ICollection`1 resolvedAssetDirectories, ICollection`1 resolvedEnvironments)
at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() SouqAlData.Android


enter image description here







visual-studio xamarin xamarin.forms xamarin.android file-not-found






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edited Nov 20 at 16:48









magicandre1981

15k34778




15k34778










asked Nov 20 at 15:35









Khalid Hex

267




267












  • In addition to regular cleaning try deleting the obj and bin folders from all project folders and then try again.
    – Gerald Versluis
    Nov 20 at 15:42










  • Can you add the exception in text format, that makes it easier to copy/paste for referencing and searching?
    – Dominique
    Nov 20 at 15:43










  • Yes i deleted the obj-bin , same result .
    – Khalid Hex
    Nov 20 at 15:57










  • I edited the post ..
    – Khalid Hex
    Nov 20 at 16:00










  • which VS version do you use? Update to 15.9.2 and look if you can build it now.
    – magicandre1981
    Nov 20 at 16:49


















  • In addition to regular cleaning try deleting the obj and bin folders from all project folders and then try again.
    – Gerald Versluis
    Nov 20 at 15:42










  • Can you add the exception in text format, that makes it easier to copy/paste for referencing and searching?
    – Dominique
    Nov 20 at 15:43










  • Yes i deleted the obj-bin , same result .
    – Khalid Hex
    Nov 20 at 15:57










  • I edited the post ..
    – Khalid Hex
    Nov 20 at 16:00










  • which VS version do you use? Update to 15.9.2 and look if you can build it now.
    – magicandre1981
    Nov 20 at 16:49
















In addition to regular cleaning try deleting the obj and bin folders from all project folders and then try again.
– Gerald Versluis
Nov 20 at 15:42




In addition to regular cleaning try deleting the obj and bin folders from all project folders and then try again.
– Gerald Versluis
Nov 20 at 15:42












Can you add the exception in text format, that makes it easier to copy/paste for referencing and searching?
– Dominique
Nov 20 at 15:43




Can you add the exception in text format, that makes it easier to copy/paste for referencing and searching?
– Dominique
Nov 20 at 15:43












Yes i deleted the obj-bin , same result .
– Khalid Hex
Nov 20 at 15:57




Yes i deleted the obj-bin , same result .
– Khalid Hex
Nov 20 at 15:57












I edited the post ..
– Khalid Hex
Nov 20 at 16:00




I edited the post ..
– Khalid Hex
Nov 20 at 16:00












which VS version do you use? Update to 15.9.2 and look if you can build it now.
– magicandre1981
Nov 20 at 16:49




which VS version do you use? Update to 15.9.2 and look if you can build it now.
– magicandre1981
Nov 20 at 16:49












1 Answer
1






active

oldest

votes

















up vote
1
down vote



accepted










My understanding of the situation tells me that you do not have the latest version of Xamarin which comes along with Visual Studio 15.9.xx.



And hence when you update your Xamarin Forms package to the latest version of that is available it sees a discrepancy in between the versions and hence might be throwing this. One more reason could be that when you update your Xamarin Forms package, somehow the path for your SouqAlData.dll is lost by VS and hence you get this error. What I would suggest you do in case two is that you provide the proper path for your .dll again to VS and see if that helps you build the project.



You can give the path as follows:




  • Remove the existing reference to the .dll

  • In your project go to References>Add Reference>Browse then give it the .dll path from your solution directory.


Update:



From recent Xamarin forms update code behind doesn't support Task return type as signatures for event handlers.



So Replacing the Task with Void return type did the trick. Reference






share|improve this answer























  • Well i can't reference it because it doesn't exist , like i said i can't build the project ... when i downgrade to a lower version i can build the project and the directory that contain .dll is there ... but when i update the packages and hit rebuild the netstandard2.0 directory that contain SouqAlData.dll doesn't exist and i think that because the project hasn't successfully been built in the first place .
    – Khalid Hex
    Nov 21 at 13:46










  • Is SouqAlData a project in your solution or an external dll?
    – G.hakim
    Nov 21 at 13:50












  • That is the project name ..
    – Khalid Hex
    Nov 21 at 13:55












  • Did you try updating visual studio to the latest version?
    – G.hakim
    Nov 21 at 14:01










  • I update it to latest version 15.9.2 ....
    – Khalid Hex
    Nov 21 at 14:05











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
1
down vote



accepted










My understanding of the situation tells me that you do not have the latest version of Xamarin which comes along with Visual Studio 15.9.xx.



And hence when you update your Xamarin Forms package to the latest version of that is available it sees a discrepancy in between the versions and hence might be throwing this. One more reason could be that when you update your Xamarin Forms package, somehow the path for your SouqAlData.dll is lost by VS and hence you get this error. What I would suggest you do in case two is that you provide the proper path for your .dll again to VS and see if that helps you build the project.



You can give the path as follows:




  • Remove the existing reference to the .dll

  • In your project go to References>Add Reference>Browse then give it the .dll path from your solution directory.


Update:



From recent Xamarin forms update code behind doesn't support Task return type as signatures for event handlers.



So Replacing the Task with Void return type did the trick. Reference






share|improve this answer























  • Well i can't reference it because it doesn't exist , like i said i can't build the project ... when i downgrade to a lower version i can build the project and the directory that contain .dll is there ... but when i update the packages and hit rebuild the netstandard2.0 directory that contain SouqAlData.dll doesn't exist and i think that because the project hasn't successfully been built in the first place .
    – Khalid Hex
    Nov 21 at 13:46










  • Is SouqAlData a project in your solution or an external dll?
    – G.hakim
    Nov 21 at 13:50












  • That is the project name ..
    – Khalid Hex
    Nov 21 at 13:55












  • Did you try updating visual studio to the latest version?
    – G.hakim
    Nov 21 at 14:01










  • I update it to latest version 15.9.2 ....
    – Khalid Hex
    Nov 21 at 14:05















up vote
1
down vote



accepted










My understanding of the situation tells me that you do not have the latest version of Xamarin which comes along with Visual Studio 15.9.xx.



And hence when you update your Xamarin Forms package to the latest version of that is available it sees a discrepancy in between the versions and hence might be throwing this. One more reason could be that when you update your Xamarin Forms package, somehow the path for your SouqAlData.dll is lost by VS and hence you get this error. What I would suggest you do in case two is that you provide the proper path for your .dll again to VS and see if that helps you build the project.



You can give the path as follows:




  • Remove the existing reference to the .dll

  • In your project go to References>Add Reference>Browse then give it the .dll path from your solution directory.


Update:



From recent Xamarin forms update code behind doesn't support Task return type as signatures for event handlers.



So Replacing the Task with Void return type did the trick. Reference






share|improve this answer























  • Well i can't reference it because it doesn't exist , like i said i can't build the project ... when i downgrade to a lower version i can build the project and the directory that contain .dll is there ... but when i update the packages and hit rebuild the netstandard2.0 directory that contain SouqAlData.dll doesn't exist and i think that because the project hasn't successfully been built in the first place .
    – Khalid Hex
    Nov 21 at 13:46










  • Is SouqAlData a project in your solution or an external dll?
    – G.hakim
    Nov 21 at 13:50












  • That is the project name ..
    – Khalid Hex
    Nov 21 at 13:55












  • Did you try updating visual studio to the latest version?
    – G.hakim
    Nov 21 at 14:01










  • I update it to latest version 15.9.2 ....
    – Khalid Hex
    Nov 21 at 14:05













up vote
1
down vote



accepted







up vote
1
down vote



accepted






My understanding of the situation tells me that you do not have the latest version of Xamarin which comes along with Visual Studio 15.9.xx.



And hence when you update your Xamarin Forms package to the latest version of that is available it sees a discrepancy in between the versions and hence might be throwing this. One more reason could be that when you update your Xamarin Forms package, somehow the path for your SouqAlData.dll is lost by VS and hence you get this error. What I would suggest you do in case two is that you provide the proper path for your .dll again to VS and see if that helps you build the project.



You can give the path as follows:




  • Remove the existing reference to the .dll

  • In your project go to References>Add Reference>Browse then give it the .dll path from your solution directory.


Update:



From recent Xamarin forms update code behind doesn't support Task return type as signatures for event handlers.



So Replacing the Task with Void return type did the trick. Reference






share|improve this answer














My understanding of the situation tells me that you do not have the latest version of Xamarin which comes along with Visual Studio 15.9.xx.



And hence when you update your Xamarin Forms package to the latest version of that is available it sees a discrepancy in between the versions and hence might be throwing this. One more reason could be that when you update your Xamarin Forms package, somehow the path for your SouqAlData.dll is lost by VS and hence you get this error. What I would suggest you do in case two is that you provide the proper path for your .dll again to VS and see if that helps you build the project.



You can give the path as follows:




  • Remove the existing reference to the .dll

  • In your project go to References>Add Reference>Browse then give it the .dll path from your solution directory.


Update:



From recent Xamarin forms update code behind doesn't support Task return type as signatures for event handlers.



So Replacing the Task with Void return type did the trick. Reference







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 21 at 14:29

























answered Nov 21 at 11:41









G.hakim

2,7231627




2,7231627












  • Well i can't reference it because it doesn't exist , like i said i can't build the project ... when i downgrade to a lower version i can build the project and the directory that contain .dll is there ... but when i update the packages and hit rebuild the netstandard2.0 directory that contain SouqAlData.dll doesn't exist and i think that because the project hasn't successfully been built in the first place .
    – Khalid Hex
    Nov 21 at 13:46










  • Is SouqAlData a project in your solution or an external dll?
    – G.hakim
    Nov 21 at 13:50












  • That is the project name ..
    – Khalid Hex
    Nov 21 at 13:55












  • Did you try updating visual studio to the latest version?
    – G.hakim
    Nov 21 at 14:01










  • I update it to latest version 15.9.2 ....
    – Khalid Hex
    Nov 21 at 14:05


















  • Well i can't reference it because it doesn't exist , like i said i can't build the project ... when i downgrade to a lower version i can build the project and the directory that contain .dll is there ... but when i update the packages and hit rebuild the netstandard2.0 directory that contain SouqAlData.dll doesn't exist and i think that because the project hasn't successfully been built in the first place .
    – Khalid Hex
    Nov 21 at 13:46










  • Is SouqAlData a project in your solution or an external dll?
    – G.hakim
    Nov 21 at 13:50












  • That is the project name ..
    – Khalid Hex
    Nov 21 at 13:55












  • Did you try updating visual studio to the latest version?
    – G.hakim
    Nov 21 at 14:01










  • I update it to latest version 15.9.2 ....
    – Khalid Hex
    Nov 21 at 14:05
















Well i can't reference it because it doesn't exist , like i said i can't build the project ... when i downgrade to a lower version i can build the project and the directory that contain .dll is there ... but when i update the packages and hit rebuild the netstandard2.0 directory that contain SouqAlData.dll doesn't exist and i think that because the project hasn't successfully been built in the first place .
– Khalid Hex
Nov 21 at 13:46




Well i can't reference it because it doesn't exist , like i said i can't build the project ... when i downgrade to a lower version i can build the project and the directory that contain .dll is there ... but when i update the packages and hit rebuild the netstandard2.0 directory that contain SouqAlData.dll doesn't exist and i think that because the project hasn't successfully been built in the first place .
– Khalid Hex
Nov 21 at 13:46












Is SouqAlData a project in your solution or an external dll?
– G.hakim
Nov 21 at 13:50






Is SouqAlData a project in your solution or an external dll?
– G.hakim
Nov 21 at 13:50














That is the project name ..
– Khalid Hex
Nov 21 at 13:55






That is the project name ..
– Khalid Hex
Nov 21 at 13:55














Did you try updating visual studio to the latest version?
– G.hakim
Nov 21 at 14:01




Did you try updating visual studio to the latest version?
– G.hakim
Nov 21 at 14:01












I update it to latest version 15.9.2 ....
– Khalid Hex
Nov 21 at 14:05




I update it to latest version 15.9.2 ....
– Khalid Hex
Nov 21 at 14:05


















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