Set the right folder in settings of Smplphotoalbum. This is not a folder: '/srv/www/int.szily.hu/sites/default/files/photoalbum//2018_projektoktatas/Penzugyeink/'
There is no cache folder or not writable:
Error message
Warning: mkdir(): Permission denied in Drupal\smplphotoalbum\ImageList->__construct() (line 165 of modules/smplphotoalbum/src/ImageList.php).
Warning: Undefined variable $tempfolder in Drupal\smplphotoalbum\ImageList->__construct() (line 169 of modules/smplphotoalbum/src/ImageList.php).
