Image (File) Manager issue. Logging out with iframe in Opencart

Hi Team,

I am not an expert of php thus i am stuck with an issue with php in opencart.

I am having a hard time using image manager in opencart for browsing images (files) in image (file) manager.

I have uploaded the images using Filezilla already.

Whenever i click on Browse in Product page to assign a image to product, my image manager automatically logs me out in new iframe and my image manager windows crashes and after that all previous changes always get lost.

This is quite annoying as i am unable to assign any image to any product..

I am attaching the error screenshot. Dont know if its problem with filemanager or any token/cookie/caching issue.

Any help in this regard will be very helpful

Please help me out of this. Sorry for my bad english.

Thanks