Copy Paste Function Not Working In P6

Good  morning,

I am struggling with Primavera to Copy Paste a schedule. When I select paste once schedule is copied, I do not have the option to select Summary Data, when I then select ok I recieve an error that reads Item not found and it gives me an Ok button to select. Once I select Ok I am on the Copy WBS Options box, but do not have the option to select the activities block. Once I select Ok I again recieve the same error that reads Item not found. No activities copy over at all.

Does anybody have an idea how I can correct this issue?

Thank you,

Peter