Non-erasable field in Thememakers Toolkit

I aborted the uploading of an object two days ago and since then this field has "Nothing found" in the object folder.

There is nothing in the "See error message" field except an exclamation point.

But I can not delete the entry either. What can I do???
Same problem. If you abort an upload, it can't be deleted as it can't find an item. What I did was go to the main item list "My items", and had to delete it from that list. Only problem is, if you have other revisions of that item, they get deleted too. Not too bad though, as they're usually your previous revisions. If you make a newer revision (after the aborted one), you'll have to lose that too in order to delete the aborted one.