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ASP.NET SessionState error: Provider must implement the class 'System.Web.SessionState.SessionStateStoreProviderBase'

After switching to the async SQL Session State Provider one of our projects failed to run. Instead we got a yellow-screen-of-death with the following message:

Provider must implement the class 'System.Web.SessionState.SessionStateStoreProviderBase'

I had to take one extra manual step to get the async provider up and running. I had to replace the default session state module by an async alternative:

<system.webServer>
<modules>
<remove name="Session" />
<add name="Session"
type="Microsoft.AspNet.SessionState.SessionStateModuleAsync, Microsoft.AspNet.SessionState.SessionStateModule, Version=1.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
preCondition="integratedMode" />
</modules>
</system.webServer>
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