An error Has occured! Unable to load the 'Gallery' template.

What do you have an empty spot in the admin center where the gallery configuration text should be?

If not make sure the text below is inside of themes/default/languages /modifications.english.php file and any other modifications.language.php file in there. If you are using another theme other than a default repat the above except modify themes/yourtheme/languages /modifications.english.php

Code:

//Begin SMF Gallery Text Strings
$txt['smfgallery_menu'] = 'Gallery';
$txt['smfgallery_admin'] = 'Gallery Configuration';

//Permissions
$txt['permissiongroup_smfgallery'] = 'SMF Gallery';

$txt['permissionname_smfgallery_view'] = 'View SMF Gallery';
$txt['permissionhelp_smfgallery_view'] = 'Allows the user to view the Gallery';
$txt['cannot_smfgallery_view'] = 'You are not allowed to view the Gallery';

$txt['permissionname_smfgallery_add'] = 'Add Picture';
$txt['permissionhelp_smfgallery_add'] = 'Allows the user to add a picture.';
$txt['cannot_smfgallery_add'] = 'You are not allowed to add a picture.';

$txt['permissionname_smfgallery_bulk'] = 'Bulk Uploads';
$txt['permissionhelp_smfgallery_bulk'] = 'Allows the user to use the bulk upload feature.';
$txt['cannot_smfgallery_bulk'] = 'You are not allowed to bulk upload.';

$txt['permissionname_smfgallery_edit'] = 'Edit own Picture';
$txt['permissionhelp_smfgallery_edit'] = 'Allows the user to edit their own picture.';
$txt['cannot_smfgallery_edit'] = 'You are not allowed to edit that picture.';

$txt['permissionname_smfgallery_delete'] = 'Delete own Picture';
$txt['permissionhelp_smfgallery_delete'] = 'Allows the user to delete their own picture.';
$txt['cannot_smfgallery_delete'] = 'You are not allowed to delete that picture.';

$txt['permissionname_smfgallery_ratepic'] = 'Rate Picture';
$txt['permissionhelp_smfgallery_ratepic'] = 'Allows the user to rate a picture.';
$txt['cannot_smfgallery_ratepic'] = 'You are not allowed to rate that picture.';

$txt['permissionname_smfgallery_editcomment'] = 'Edit own Comment';
$txt['permissionhelp_smfgallery_editcomment'] = 'Allows the user to edit their own comments.';
$txt['cannot_smfgallery_editcomment'] = 'You are not allowed to edit that comment.';

$txt['permissionname_smfgallery_comment'] = 'Leave Comments';
$txt['permissionhelp_smfgallery_comment'] = 'Allows the user to leave comments on a picture.';
$txt['cannot_smfgallery_comment'] = 'You are not allowed to leave comments.';

$txt['permissionname_smfgallery_report'] = 'Report Pictures/Comments';
$txt['permissionhelp_smfgallery_report'] = 'Allows the user to report pictures and comments.';
$txt['cannot_smfgallery_report'] = 'You are not allowed to report content.';

$txt['permissionname_smfgallery_autocomment'] = 'Auto Approve Comments';
$txt['permissionhelp_smfgallery_autocomment'] = 'Comments do not need to wait for approval.';

$txt['permissionname_smfgallery_autoapprove'] = 'Auto Approve Pictures';
$txt['permissionhelp_smfgallery_autoapprove'] = 'Pictures do not need to wait for approval.';

$txt['permissionname_smfgallery_usergallery'] = 'Personal Gallery';
$txt['permissionhelp_smfgallery_usergallery'] = 'Allows the user to have a personal gallery';
$txt['cannot_smfgallery_usergallery'] = 'You are not allowed to have a gallery.';

$txt['permissionname_smfgallery_manage'] = 'Admin Gallery';
$txt['permissionhelp_smfgallery_manage'] = 'Allows the user to add/delete/edit all catagories. Delete Comments, Delete Pictures, Approve Pictures';
$txt['cannot_smfgallery_manage'] = 'You are not allowed to manage gallery.';

//END SMF Gallery Text Strings