"Unable to start profiling. The system cannot find the file specified" error occurs when attaching to Windows Service process

Symptoms:

When you attach the profiler to the process, it shows the message "Preparing the profiler..." for about 1 minute and then fails with the error:

"Unable to start profiling. The system cannot find the file specified".

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Possible cause:

CLR doesn't start the "attach" thread for the application.

To resolve the issue:

1. Open regedit.exe
2. Find HKLM\SYSTEM\CurrentControlSet\Services\<YourServiceName>
3. Add a new multi-string value (REG_MULTI_SZ) with the Environment name
4. Add value COMPlus_AttachThreadAlwaysOn=1 , then press Enter to apply the key change 
5. Restart your service