drupal integration problem

I have gallery2 integrated into Drupal 5.7, I just discovered that when I' log-off from the site, the home throws a white page caused by gallery2 module and disappear if I uninstall the gallery module in drupal.
Error:

Notice: Use of undefined constant GALLERY_IMAGEBLOCK_SIZE_DEFAULT - assumed 'GALLERY_IMAGEBLOCK_SIZE_DEFAULT' in /var/www/vhosts/artblueprint.org/httpdocs/sites/all/modules/gallery/gallery.module on line 10

Notice: Use of undefined constant GALLERY_GRID_SIZE_METHOD_DEFAULT - assumed 'GALLERY_GRID_SIZE_METHOD_DEFAULT' in /var/www/vhosts/artblueprint.org/httpdocs/sites/all/modules/gallery/gallery.module on line 11

Notice: Use of undefined constant GALLERY_GRID_SIZE_DEFAULT - assumed 'GALLERY_GRID_SIZE_DEFAULT' in /var/www/vhosts/artblueprint.org/httpdocs/sites/all/modules/gallery/gallery.module on line 12

Notice: Use of undefined constant GALLERY_SEARCH_SIZE_METHOD_DEFAULT - assumed 'GALLERY_SEARCH_SIZE_METHOD_DEFAULT' in /var/www/vhosts/artblueprint.org/httpdocs/sites/all/modules/gallery/gallery.module on line 13

Notice: Use of undefined constant GALLERY_SEARCH_SIZE_DEFAULT - assumed 'GALLERY_SEARCH_SIZE_DEFAULT' in /var/www/vhosts/artblueprint.org/httpdocs/sites/all/modules/gallery/gallery.module on line 14

Notice: Use of undefined constant GALLERY_FILTER_MAXSIZE_DEFAULT - assumed 'GALLERY_FILTER_MAXSIZE_DEFAULT' in /var/www/vhosts/artblueprint.org/httpdocs/sites/all/modules/gallery/gallery.module on line 15

Notice: Use of undefined constant GALLERY_FILTER_EXACTSIZE_DEFAULT - assumed 'GALLERY_FILTER_EXACTSIZE_DEFAULT' in /var/www/vhosts/artblueprint.org/httpdocs/sites/all/modules/gallery/gallery.module on line 16
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I spent three days testings different things: re-run gallery2 intaller, upgrader, etc with no luck.
I desperately need help here.

Thanks