Could not load file or assembly System.Runtime.CompilerServices.Unsafe

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Could not load file or assembly System.Runtime.CompilerServices.Unsafe

It seems that you have installed System.Runtime.CompilerServices.Unsafe nuget package 4.5.3 version. And it corresponds to System.Runtime.CompilerServices.Unsafe.dll assembly version 4.0.4.1.

Suggestion

1) Please try to register System.Runtime.CompilerServices.Unsafe version 4.0.4.1 into GAC so that the system can it.

  • Run Developer Command Prompt for VS2019 as Administrator

  • type:

    cd xxxxx (the path of the the System.Runtime.CompilerServices.Unsafe 4.0.4.1)

gacutil /i System.Runtime.CompilerServices.Unsafe.dll

2) If you use Net Framework projects with xxx.config file, you could use bindingRedirect.

Add these in app.config file or web.config file:

<configuration>  
   <runtime>  
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">  
         <dependentAssembly>  
            <assemblyIdentity name="System.Runtime.CompilerServices.Unsafe"  
                              publicKeyToken="b03f5f7f11d50a3a"  
                              culture="neutral" />  
            <bindingRedirect oldVersion="0.0.0.0-4.0.4.1"  
                             newVersion="4.0.4.1"/>  
         </dependentAssembly>  
      </assemblyBinding>  
   </runtime>  
</configuration>

Besides, if you update System.Runtime.CompilerServices.Unsafe nuget package version to the newer version, you should also changed the bindingRedirect assembly version.

You can refer to these assembly versions of System.Runtime.CompilerServices.Unsafe

4.5.x is System.Runtime.CompilerServices.Unsafe nuget package version while 4.0.x.x is System.Runtime.CompilerServices.Unsafe.dll assembly version.

4.5.0 is 4.0.4.0 
4.5.1 is 4.0.4.0 
4.5.2 is 4.0.4.0 
4.5.3 is 4.0.4.1
4.6.0 is 4.0.5.0
4.7.0 is 4.0.6.0
4.7.1 is 4.0.6.1
5.0.0 is 5.0.0.0

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