This is a very intermittent behavior. I usually get this issue once or twice a month. Following steps would resolve the problem easily.
Before trying anything else, try iisreset
Step 1: >> Open Run (Ctrl +R) >> type iisreset
If this doesn’t work, then try step 2.
Step 2: Open task manager >> Processes >> select Process and right click >> end task. This should kill IIS worker process.
If step 2 doesn’t work for you then go to step 3.
Step 3: Task manager >> Services and restart the IISADMIN.
Some of you might not have IISADMIN service so If you can see IISADMIN, right click and restart.
