Fixed – Feature ‘Semantic classification, Document Highlights, etc. ’ is currently unavailable due to internal error – Visual Studio

Recently we were getting the below notifications in our Visual Studio 2019.

The way we managed to fix it was by disabling the following option – “Use 64-bit process for code analysis“

Navigate to Tools >> Options >> Text Editor >> C# >> Advanced

The “Use 64-bit process for code analysis” option in Visual Studio allows the code analysis tools to run in a 64-bit process instead of a 32-bit process. This option is relevant when we are performing static code analysis, and here we had recently installed a Visual Studio extension that does the same. So might as well be a compatibility issue with that extension.

Hope it helps..