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since yesterday I have a problem that when I create an empty CLR (.NET) project in visual studio and want to run it, I get error C1001 and that the file cannot be found. What should I do ?
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For starters, you could post the entire text of the error message.
Also tell us what version of Visual Studio you are using. See How do I workaround error C1001 in visual C++ compiler? - Stack Overflow for a sample of how to report a problem such as this. If you can create a complete yet small sample as in c++ - MSVC compiler fatal error C1001 using pointer to method - Stack Overflow then you are nearly guaranteed a solution. Also see fatal error C1001: An internal error has occurred in the compiler. (compiler file 'msc1.cpp', line 1325) - Microsoft Q&A. The Microsoft documentation is at Fatal Error C1001; it indicates it might be a compiler bug, but first follow all the other advice in the documentation and forum posts.