RunJobs.php
Fragment of a discussion from Project:Support desk
MobileDetect runs even when in command line mode. That fails because in command line mode no web browser is accessing the wiki, so one can't detect if its a mobile browser.
The bug is in the extension, and would need to be fixed by the extensions maintainer.
However, with that said, you could probably safely ignore the warnings and unless some critical setting is depending on the results of mobile detect, nothing bad will happen.
