Cant delete from gallery, please help.

[Hendrix]

I have made a couple of mistakes in the gallery that was made for me. When I try to delete them I get an error notice, please help.
This is the error notice:
Error Detail -
Error (ERROR_LOCK_REQUIRED) :
in modules/core/classes/GalleryEntity.class at line 358 (GalleryDerivativeImage::error)
in modules/core/classes/GalleryDerivative.class at line 232 (GalleryDerivativeImage::delete)
in modules/core/classes/helpers/GalleryEntityHelper_medium.class at line 123 (GalleryDerivativeImage::delete)
in modules/core/classes/GalleryCoreApi.class at line 2198 (GalleryPhotoItem::deleteEntityById)
in modules/core/classes/GalleryItem.class at line 326 (GalleryPhotoItem::deleteEntityById)
in modules/core/classes/GalleryDataItem.class at line 244 (GalleryPhotoItem::delete)
in modules/core/classes/helpers/GalleryEntityHelper_medium.class at line 123 (GalleryPhotoItem::delete)
in modules/core/classes/GalleryCoreApi.class at line 2198 (ItemDeleteController::deleteEntityById)
in modules/core/ItemDelete.inc at line 86 (ItemDeleteController::deleteEntityById)
in main.php at line 174 (ItemDeleteController::handleRequest)
in main.php at line 87
in modules/core/classes/GalleryEmbed.class at line 153
in /var/www/html/modules/pnGallery2/pnuser.php at line 46 (GalleryEmbed::handleRequest)
in /var/www/html/includes/pnMod.php at line 731
in /var/www/html/index.php at line 108

 

[jnglgrl]

I cant delete any neither, i thought i jus had2 work it out lol. Theres1 pic in my gallery that was a mistake

 

[Slateman]

PM to David Lutzd. Nickname Lutzd or SJ> Slateman junior

 

[lutzd]

I can't help with this one, so don't PM me! I've already asked SJ to have a look at it as soon as he has time (he's a really busy guy!). In fact, don't PM him on this one - he's already been advised.