Image import error

Image import error

Hi there,
I have a problem with one of the old project.
I need to add few new images to the gallery. I created new image slots in Gallery Image section. But when I try drag&drop the image to the slot I get pop-up message that system can not find some elements.

How can I solve this issue?

P.S: The project was done a long time ago on an other computer. I am not sure, that all needed elements were copied. "Local folder" section is clear.