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Unable to start the K2 Blackpearl Service

This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.
This article has been archived, and/or refers to legacy products, components or features. The content in this article is offered "as is" and will no longer be updated. Archived content is provided for reference purposes only. This content does not infer that the product, component or feature is supported, or that the product, component or feature will continue to function as described herein.


The K2 Blackpearl service fails to start and returns the following error: 

Error Starting Host Server: System.TypeInitializationException: The type initializer for 'SourceCode.Data.Dac' threw an exception. ---> System.MissingMethodException: Method not found: 'System.String System.String.Format(System.IFormatProvider, System.String, System.Object)'.
at SourceCode.Diagnostics.Logging.LoggingFactory.CreateLoggerInstance(RuntimeTypeHandle typeHandle)
at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
at SourceCode.Diagnostics.Logging.LoggingFactory.CreateLogger[T]()
at SourceCode.Data.Dac..cctor()


It was determined that Microsoft .NET Framework 4.6.1 was not installed via the release key, as per: 

Troubleshooting Steps

As .NET Framework 4.6.1 is required for K2 Blackpearl version 4.7, please install it on the server to resolve the issue.