Hello @Wise and @LeonidS

there is an typo error in first line!

Now is " publicfunction " but it must be " public function "

And yes, after I manually changed the code in a file "/una/modules/boonex/timeline/classes/BxTimelineGridMute.php"

the Error 500 is gone and the URL "https://www(dot)exemple(dot)com/timeline-manage?owner=1" now works.

Thank you

Best regards

Mayki