After installing, none of my page images get added, and when I run PageImages/maintenance/initImageData.php I get the following warnings:
PHP Warning: array_flip(): Can only flip STRING and INTEGER values! in /htdocs/extensions/PageImages/includes/ParserFileProcessingHookHandlers.php on line 123
PHP Warning: array_flip(): Can only flip STRING and INTEGER values! in /htdocs/extensions/PageImages/includes/ParserFileProcessingHookHandlers.php on line 123