For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
Warning: simplexml_load_file(/xxx/httpdocs/components/com_fabrik/views/details/tmpl/default.xml): failed to open stream: Permission denied in /xxx/administrator/components/com_menus/models/menutypes.php on line 585
Warning: simplexml_load_file(): I/O warning : failed to load external entity "/xxx/components/com_fabrik/views/details/tmpl/default.xml" in /xxx/administrator/components/com_menus/models/menutypes.php on line 585
Fatal error: Uncaught TypeError: Argument 1 passed to plgSystemReDJ::customException() must be an instance of Exception, instance of ParseError given in /xxx/plugins/system/redj/redj.php:673 Stack trace: #0 [internal function]: plgSystemReDJ::customException(Object(ParseError)) #1 {main} thrown in /xxx/plugins/system/redj/redj.php on line 673