the plugin activates ok, uploads blog image or user avatar

Hi, the plugin activates ok, uploads blog image or user avatar ok, the croping is ok but than it gives 404 on image.

i have tried jpeg and png, the result is the same..

the link to image is something like this and gives 404

domain.com/avatar/blog-1-96.png?rand=78a0cceab9b64055da8131c4e425dd25