laravel serve Unknown: failed to open stream: No such file or directory in Unknown on line 0 [Wed Aug 18 15:55:47 2021] PHP Fatal error: Unknown: Failed opening required server.php
The problem was that the initial directory included server.php file and the second time around it was missing.
For me this was a weird interaction with Avast as it perceived the file as malicious. Check Avast's Virus chest to recover the file to avoid further issues.
Maybe this will save time for somebody.