| Institute of History University of Warsaw

Error message

Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /srv/www/ihuw-site/public/includes/entity.inc).
Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 388 of /srv/www/ihuw-site/public/includes/entity.inc).