Error adding pending files

In the “My Pending Files” window (this happens for several files) in many cases when I try to add selected files to “My Safe Files” (using the “Move to” button) I get a message like this:
“Error adding c:.…path…\filename to safe files: 5”
(This for files I never added before.)
Why this?
Any workaround?

Tech info:
WinXP Pro SP2
CPF v3.0.13.268

I have the same trouble.
Sometimes more then thousands!
How to solve this problem???javascript:void(0);