[phpBB Debug] PHP Warning: in file [ROOT]/gallery/image_page.php on line 19: Use of undefined constant GALLERY_ROOT_PATH - assumed 'GALLERY_ROOT_PATH' (this will throw an Error in a future version of PHP)

Fatal error: Uncaught phpbb\language\exception\language_file_not_found: Language file ../language/en/mods/gallery.php couldn't be opened. in /home/ausbonsa/public_html/forum/phpbb/language/language_file_loader.php:186 Stack trace: #0 /home/ausbonsa/public_html/forum/phpbb/language/language_file_loader.php(143): phpbb\language\language_file_loader->get_language_file_path('../language/', 'mods/gallery.ph...', Array) #1 /home/ausbonsa/public_html/forum/phpbb/language/language_file_loader.php(77): phpbb\language\language_file_loader->load_file('../language/', 'mods/gallery', Array, Array) #2 /home/ausbonsa/public_html/forum/phpbb/language/language.php(625): phpbb\language\language_file_loader->load('mods/gallery', Array, Array) #3 /home/ausbonsa/public_html/forum/phpbb/language/language.php(184): phpbb\language\language->load_core_file('mods/gallery') #4 /home/ausbonsa/public_html/forum/phpbb/user.php(576): phpbb\language\language->add_lang('mods/gallery', NULL) #5 /home/ausbonsa/public_html/forum/phpbb/user.php(535): phpbb\u in /home/ausbonsa/public_html/forum/phpbb/language/language_file_loader.php on line 186