Error Processing Tabular – Method Not Found

Very quick blog post today. While setting-up a development server at a client who is still using SQL Server 2012, I was greeted with the following error while processing a Tabular model:

Errors in the high-level relational engine. The following exception occurred while an operation was being performed on a data source view: Method not found: ‘System.Threading.Tasks.Task`

A quick search indicated other people have struggled with this issue, but no solution were provided in the forums. After digging a bit more, I found related issues but rather for .NET developers, so it’s not for Tabular only. The solution was actually quite easy: upgrade the server to the latest .NET environment. After rebooting the server, I could finally process my Tabular model.

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Koen Verbeeck

Koen Verbeeck is a Microsoft Business Intelligence consultant at AE, helping clients to get insight in their data. Koen has a comprehensive knowledge of the SQL Server BI stack, with a particular love for Integration Services. He's also a speaker at various conferences.

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