Parameter 1 to imagefield_widget() expected to be a reference, value given in \includes\module.inc on line 462

I can't find a working solution for this, whenever I want to edit a node that contains an several images within the imageField with FUpload I get this error for each image contained in the field

warning: Parameter 1 to imagefield_widget() expected to be a reference, value given in C:\...\xampp\htdocs\mywebsite\includes\module.inc on line 462.

Also, going into the edit mode the node will erase de the images that were previously uploaded.

Does anyone have the same problem? How can I fix it? I'm not a programmer so I can't really modify codes myself. Any help would be very much apreciated.