This is a warning caused by PHPStan of the warnings plugin. It seems that the parser creates a warning for a file “…/…/”. This file obviously does not exist.
This has something to do with the parser resolving absolute paths. If you share the log that contains the warning I can help to see if the parser needs a fix.
It seems that PHPStan reads an XML file with the CheckStyle parser. So we need the part of the XML file that contains issues for the file that has not been found by the forensics plugin. Your marked it with ‘…/…/’.
What exactly is the filename in the warning? What is the absolute filename? You can anonymize the names (but not with …, use words).