oracle error - ORA-00082: memory size of string is not in valid set of [1], [2], [4]stringstringstringstringstring

ORA-00082:  memory size of string is not in valid set of [1], [2], [4]stringstringstringstringstring

Cause: An invalid length was specified for the POKE command.

Action: Use a valid length (either 1, 2, 4, or possibly 8).