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Troubleshooting installation errors

At the end of an on-prem installation, one of the following error messages might appear. Follow the instructions to correct the error.

Could not load file or assembly 'System.Diagnostics.DiagnosticSource'

If you get the Could not load file or assembly 'System.Diagnostics.DiagnosticSource, Version=4.0.2.0' exception:

  1. In the web.config file, add the following bindingRedirect tag:

    <dependentAssembly>
    <assemblyIdentity name="System.Diagnostics.DiagnosticSource"
        publicKeyToken="cc7b13ffcd2ddd51" 
        culture="neutral"/>
    <bindingRedirect oldVersion="0.0.0.0-4.0.2.1" newVersion="4.0.2.1"/>
</dependentAssembly>

  2. Run the installation again.

Could not load file or assembly 'Microsoft.IdentityModel.Clients.ActiveDirectory'

If you get the Could not load file or assembly 'Microsoft.IdentityModel.Clients.ActiveDirectory' exception:

  1. In the web.config file, check that the following bindings exist:

    <dependentAssembly> <assemblyIdentity name="Microsoft.IdentityModel.Clients.ActiveDirectory" publicKeyToken="31bf3856ad364e35" culture="neutral" xmlns="urn:schemas-microsoft-com:asm.v1" /> <bindingRedirect oldVersion="0.0.0.0-3.19.3.10102" newVersion="3.17.2.31801" xmlns="urn:schemas-microsoft-com:asm.v1" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="Microsoft.IdentityModel.Clients.ActiveDirectory.Platform" publicKeyToken="31bf3856ad364e35" culture="neutral" xmlns="urn:schemas-microsoft-com:asm.v1" /> <bindingRedirect oldVersion="0.0.0.0-3.19.3.10102" newVersion="3.17.2.31801" xmlns="urn:schemas-microsoft-com:asm.v1" /> </dependentAssembly>

  2. Add any missing bindings to the web.config file.

  3. Run the installation again.

Could not load file or assembly 'Polly'

If you get the Could not load file or assembly 'Polly' exception:

Could not load file or assembly ‘Microsoft.Extensions.Caching.Abstractions' or ‘Microsoft.Extensions.Caching.Memory’

If you get the "Could not load file or assembly‘Microsoft.Extensions.Caching.Abstractions' or ‘Microsoft.Extensions.Caching.Memory’ exception:

  1. In the web.config file, verify that the following bindings exist:

    <dependentAssembly>
	<assemblyIdentity
		name="Microsoft.Extensions.Caching.Abstractions"
		publicKeyToken="adb9793829ddae60"
		culture="neutral"/>
	<bindingRedirect
		oldVersion="0.0.0.0-3.1.5.0" 
		newVersion="3.1.5.0"/>
</dependentAssembly>
<dependentAssembly>
	<assemblyIdentity 
		name="Microsoft.Extensions.Caching.Memory"
		publicKeyToken="adb9793829ddae60"
		culture="neutral"/>
	<bindingRedirect 
		oldVersion="0.0.0.0-3.1.5.0" 
		newVersion="3.1.5.0"/>
</dependentAssembly>

  2. If any of the bindings are missing, add them to the web.config file, and run the installation again.

  3. Check if the bin folder contains the Microsoft.Extensions.Caching.Abstractions.dll file. If it does not, download the correct version of the file from https://www.nuget.org, and paste it into the bin folder.