Warning: require(ABSPATHWPINC/Text/Diff.php): failed to open stream: No such file or directory in /hosts/rennsteig1.de/wp-includes/wp-diff.php on line 13

Fatal error: require(): Failed opening required 'ABSPATHWPINC/Text/Diff.php' (include_path='.:/apps/php/7.0.27/lib/php') in /hosts/rennsteig1.de/wp-includes/wp-diff.php on line 13