Water Mark Not Working

after uploading the pics watermark in not working...

it shows this msg when tryng to upload pics

Edit Watermark
Warning: opendir(http://naifarians.com/Gallery/albums/): failed to open dir: not implemented in /home/naifaria/public_html/Gallery/layout/watermarkform.inc on line 62
Error: Could not open directory http://naifarians.com/Gallery/albums/

so how can i slove teh problem