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I decided to give a try to AppCenter CI to build my Xamarin project on Android & iOS.

However I have a build error that I don't meet when building directly in VisualStudio. Have you got any idea how to solve this prob ? Cause it tells me to run a Nuget Package restore, but during the build NugetPackage were restored. 

Installed:
    168 package(s) to packages.config projects
##[section]Finishing: Restore Nuget
##[section]Starting: Build Xamarin.Android project 

error NETSDK1004: Assets file '/Users/vsts/agent/2.148.1/work/1/s/MyProject/MyProject/obj/project.assets.json' not found. Run a NuGet package restore to generate this file. [/Users/vsts/agent/2.148.1/work/1/s/MyProject/MyProject/MyProject.csproj]

    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:01.99
##[error]Error: /Library/Frameworks/Mono.framework/Versions/5_16_0_0/bin/msbuild failed with return code: 1

Build output logs :

https://drive.google.com/open?id=1uWbhzDOEF6KoRlC8iGhD_ro9NEyeODu5

I checked the Target SDK version in the build setting in AppCenter, and I was targetting SDK 9.1 (Mono 5.16) ... But, I changed it to SDK 9.0 (Mono 5.12), so the one I'm targetting in my project, prob still here.

EDIT : I also noticed this error while appcenter restoring nuget package : 

[command]/bin/bash -c /usr/bin/find . -name '*.sln' -type f -print0 | /usr/bin/xargs -0 grep -l '***.Droid.csproj' | /usr/bin/xargs -I '{}' nuget restore '{}' -DisableParallelProcessing
MSBuild auto-detection: using msbuild version '15.0' from '/Library/Frameworks/Mono.framework/Versions/5.12.0/lib/mono/msbuild/15.0/bin'.
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018: The "WriteRestoreGraphTask" task failed unexpectedly. [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018: NuGet.Commands.RestoreCommandException: PackageTargetFallback and AssetTargetFallback cannot be used together. Remove PackageTargetFallback(deprecated) references from the project environment. [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Commands.AssetTargetFallbackUtility.EnsureValidFallback (System.Collections.Generic.IEnumerable`1[T] packageTargetFallback, System.Collections.Generic.IEnumerable`1[T] assetTargetFallback, System.String filePath) [0x0002d] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Commands.MSBuildRestoreUtility.AddPackageTargetFallbacks (NuGet.ProjectModel.PackageSpec spec, System.Collections.Generic.IEnumerable`1[T] items) [0x000cb] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Commands.MSBuildRestoreUtility.GetPackageSpec (System.Collections.Generic.IEnumerable`1[T] items) [0x002b3] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at System.Linq.Enumerable+SelectEnumerableIterator`2[TSource,TResult].MoveNext () [0x00048] in <cc3b329d40bd4675ae0e985e302972af>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at System.Linq.Enumerable+WhereEnumerableIterator`1[TSource].MoveNext () [0x0004e] in <cc3b329d40bd4675ae0e985e302972af>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Commands.MSBuildRestoreUtility.GetDependencySpec (System.Collections.Generic.IEnumerable`1[T] items) [0x001f8] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at NuGet.Build.Tasks.WriteRestoreGraphTask.Execute () [0x000a5] in <55431ab4846b49babe0aafcf24cd67ed>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in <2338fdb301034c1d9c6b95e564d514b0>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]
/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/wnqwdckn.p7q.nugetrestore.targets(143,5): error MSB4018:   at Microsoft.Build.BackEnd.TaskBuilder+<ExecuteInstantiatedTask>d__26.MoveNext () [0x00212] in <2338fdb301034c1d9c6b95e564d514b0>:0  [/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/u4qrmymw.ehn.nugetinputs.targets]

WARNING: Error reading msbuild project information, ensure that your input solution or project file is valid. NETCore and UAP projects will be skipped, only packages.config files will be restored.
Umar3x
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3 Answers3

3

Finally fixed my prob.

1/ I had an external assembly in my project that was not on nuget. I read that appcenter can't build a project / restore nuget if there is an assembly that does not depend on Nuget. So I updated this assembly with a nuget provided by the author.

2/ Edit I made with logs drove me on the right path.

The "WriteRestoreGraphTask" task failed unexpectedly

Solution to this is edit project .csproj and modify the line that allows fallback on .NET 4.5 from

<PackageTargetFallback>$(PackageTargetFallback);portable-net45+win8+wp8+wpa81;</PackageTargetFallback>

to

<AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>

Ref : https://intercom.help/appcenter/build/xamarin/xamarin-build-fails-with-the-writerestoregraphtask-task-failed-unexpectedly

Now I got a sucessfull build.

Umar3x
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0

I had a similar error with NETSDK1004. It seems the project.assets.json never gets generated because of an earlier failure.

Error Generated

error NETSDK1004: Assets file '/Users/runner/work/1/s/.../project.assets.json' not found. Run a NuGet package restore to generate this file.

Actual Error

In my case there was an earlier error in 9_Restore_Nuget task for App Center: NETSDK1045.

error NETSDK1045: The current .NET SDK does not support targeting .NET Core 3.1.  Either target .NET Core 2.2 or lower, or use a version of the .NET SDK that supports .NET Core 3.1.

I had put a DLL in there targeting net core 3.1 - App Center didn't like it & then failed the package restore.

So, the original error is true - project.assets.json isn't there but there is a reason & that needs exploring earlier in the build process.

Dave Tyler
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-1

I had a similar error: error netsdk1004 assets file 'C:\Users\username\source\repos\...\project.assets.json not found Run a NuGet package restore to generate this file.

All I had to do to fix it was open command prompt and then navigate to my project directory and run dotnet restore. This resolved the issue and I was able to successfully restore all .csproj files and thus build. Hope this helps!

This link helps: https://learn.microsoft.com/en-us/dotnet/core/tools/sdk-errors/netsdk1004

Aahana B.
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