Unfortunately, Oracle error "ORA-03113-End of file on comunication channel" means simply that the connection between your client session and your server session became disconnected. This can occur for dozens of reasons, from the network going down to Oracle simply becoming confused about your connection.
If you receive this error over and over while attempting to run the same code, but you do not receive the same error for virtually identical code, then we need to investigate apparent differences between the working and non-working scenarios.
So, the first question is, "Do you receive this error over and over for this same code?"
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