Warning: file_put_contents(./osmmap.php): failed to open stream: Permission denied in /volume1/web/piwigo/plugins/piwigo-openstreetmap/maintain.class.php on line 164

Fatal error: Uncaught  --> Smarty: unable to write file ./osmmap.php <-- 
  thrown in /volume1/web/piwigo/plugins/piwigo-openstreetmap/maintain.class.php on line 167