[plugin nextgen gallery] "$current->description" dosn't return anything

i using nextgen gallery. when i want to use $current->description for example at \products\photocrati_nextgen\modules\ngglegacy\view\gallery-carousel.php, it do not show me a result.
before i write this code, this example page return the result of $image->description for me, but now not. i clean my codes but $image->description and $current->description not works, i replace this file to the original file but nothing…
i use filmstrip view.

thanks