I don't recall that error ever being mentioned before.
Have you noticed a difference between clicking vs drag and dropping, or dropping on the menu bar (to put in your inventory) vs into an open container?
Are you playing the disk version or download?
There is a file verification procedure for the disk version in the
Troubleshooting Tips topic.
Did you try emailing support@larian.com? Include a description of the problem and maybe a link to this topic.
