5,380 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(198.4, 9%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
Check your NuGet packages and remove Xamarin.Android.Support.Compat NuGet package. This package is reported to produce these errors. You probably added it for compatibility with older devices.
When building a .NET Android project I'm getting the following exception:
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(153.6, 76%, 24%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMH%3C/text%3E%3C/svg%3E)
Milan Hribal
5
Reputation points
....nuget\packages\xamarin.android.support.annotations\28.0.0.3\build\monoandroid90\Xamarin.Android.Support.Annotations.targets(20,3): error MSB4018: The "VerifyVersionsTask" task failed unexpectedly.
....nuget\packages\xamarin.android.support.annotations\28.0.0.3\build\monoandroid90\Xamarin.Android.Support.Annotations.targets(20,3): error MSB4018: System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
....nuget\packages\xamarin.android.support.annotations\28.0.0.3\build\monoandroid90\Xamarin.Android.Support.Annotations.targets(20,3): error MSB4018: at System.ThrowHelper.ThrowKeyNotFoundException()
....nuget\packages\xamarin.android.support.annotations\28.0.0.3\build\monoandroid90\Xamarin.Android.Support.Annotations.targets(20,3): error MSB4018: at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
....nuget\packages\xamarin.android.support.annotations\28.0.0.3\build\monoandroid90\Xamarin.Android.Support.Annotations.targets(20,3): error MSB4018: at Xamarin.Android.Support.BuildTasks.NugetPackages.GatherProjectJsonVersions(String packageIdPrefix, String projectExtensionsPath, IEnumerable1 excludedPackages, Version monoandroidVersion, Dictionary2 packageVersions, TaskLoggingHelper log)
....nuget\packages\xamarin.android.support.annotations\28.0.0.3\build\monoandroid90\Xamarin.Android.Support.Annotations.targets(20,3): error MSB4018: at Xamarin.Android.Support.BuildTasks.VerifyVersionsTask.Execute()
....nuget\packages\xamarin.android.support.annotations\28.0.0.3\build\monoandroid90\Xamarin.Android.Support.Annotations.targets(20,3): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
....nuget\packages\xamarin.android.support.annotations\28.0.0.3\build\monoandroid90\Xamarin.Android.Support.Annotations.targets(20,3): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()
Developer technologies .NET Xamarin
{count} vote
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(316.8, 40%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYL%3C/text%3E%3C/svg%3E)
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff2023-11-10T03:12:09.0433333+00:00 For further investigation, could you please provide the following information?
- Android API version
- Could you please provide a minimal code example that reproduces this issue and update it into the issue?
Your prompt reply will be highly appreciated.
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