"Unable to start profiling. The system cannot find the file specified" error occurs if attach to ASP.NET Core 3.0 application when app pool's setting ".NET CLR version" is set to ".NET CLR Version v 4.0"
https://youtrack.jetbrains.com/issue/PROF-903
https://github.com/dotnet/runtime/issues/13436
Workaround: change the app's pool setting to "No Managed Code" value and restart IIS.
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