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Azure DevOps - SonarQube - error CS0006: Metadata file 'Google.Protobuf.dll' could not be found

Automated deployments are great, until the moment your builds start to fail due to side-effects.

Last week when trying to build and deploy an application using Azure DevOps, the build failed with the following error messages in the log:

2019-02-20T20:47:57.0671661Z   CSC : error CS0006: Metadata file 'D:\b\3\_work\_temp\.sonarqube\resources\0\Google.Protobuf.dll' could not be found

2019-02-20T20:47:57.0671661Z   CSC : error CS0006: Metadata file 'D:\b\3\_work\_temp\.sonarqube\resources\0\SonarAnalyzer.CSharp.dll' could not be found

2019-02-20T20:47:57.0671661Z   CSC : error CS0006: Metadata file 'D:\b\3\_work\_temp\.sonarqube\resources\0\SonarAnalyzer.dll' could not be found

I knew that I had seen this error before: https://bartwullems.blogspot.com/2018/11/tfs-build-sonarqube-error.html, but the things that worked then didn’t help.

After rebooting the server, cleaning the build folder, praying to all the known and unknown gods, I finally found a solution(read workaround) that worked:

I deleted all the .sonarqube folders found in the ‘_work’ directory of the build agent.

Anyone who has a ‘real’ solution?

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