Deleting from desktop/folder viewer

A small problem with KDE 4.2. I have the desktop folder viewer set as my background and have another folder view plasmoid on my desktop. When i try to use the delete things from either one the system refuses, complaining that:

The key sequence ‘Del’ is ambiguous. Use ‘Configure Shortcuts’
from the ‘Settings’ menu to solve the ambiguity.
No action will be triggered.

This does not always happen, but it is annoying. Is there anything i can do about this?