Problem deleting old Clip from a pool

Hello ,

I have some old Clips on a pool that I can't delete.

I can retrieve a clip from the pool with  Retrieve_Content function without problem but I can't delete it .

When I try to run the fuction Delete_Content the message that I receive is "Clip CDF is not found in the pool" .

On the other hand , if now I write a clip on this pool , I can retrieve it and I can delete it without any problem .

Only is a problem with old clips of theis pool.

Any idea ?