Automator: Delete source images after importing them is not working

I have an automator script that takes photos from a particular folder and adds it to a particular album in iphotos. One of the function block used is

Import Files into iPhotos.

with the option of

Delete Source images after importing them.

This option even when marked true, the script is not deleting the images from the source folders. Has anyone one faced the same issue and how to solve this?

I have Macbook Pro 2012 model and iphoto 9.1, Automator 2.3, OS X 10.8.5