Visual Studio won't compile

Recently i upgraded my Unity project to version 2021.2.1f (+ HDRP 12.1), everything works fine in het Unity editor, it compiles and i can run my game. But when i try to compile the code in Visual Studio it fails to compile; i get a 100 errors:



I've tried to 'regenerate project files' but this doesnt make a difference.

When i create a new clean project (also HDRP) it does compile in visual studio. In my converted project, Unity automatically adds a .csproj named 'Unity.RenderPipelines.HighDefinition.Runtime', this is the project giving the errors;

Any advice/suggestions? Thnx

 

I was using the assets AmplifyImposters & ShaderGraphExtensions which were the reason the not compiling projects were opened in visual studio, i removed the assets and this fixed the errors.