There are [$2 some other files] already on the site with the same content.
MediaWiki:Api-error-duplicate
From EconWiki
Warning: Trying to access array offset on value of type bool in /customers/7/c/4/teralaser.net/httpd.www/economics/w/includes/libs/IPSet.php on line 243 Warning: Trying to access array offset on value of type bool in /customers/7/c/4/teralaser.net/httpd.www/economics/w/includes/libs/IPSet.php on line 246 Warning: Trying to access array offset on value of type bool in /customers/7/c/4/teralaser.net/httpd.www/economics/w/includes/libs/IPSet.php on line 243 Warning: Trying to access array offset on value of type bool in /customers/7/c/4/teralaser.net/httpd.www/economics/w/includes/libs/IPSet.php on line 246