FCB corrupted

Hi,

I have 5 AC450 controllers.
Recently when i launch one of the AC from the Application Builder (offline) it shows this message :

Function Chart Builder #13000
data corrupted: class <> page break

When i click Ok, this message appear :

E:\AdvaBNT\FCB\50r0\Bin32\FCB32.EXE
abnormal program termination.

I need a help to understand the problem and how can i resolve it.

Thanks.