An invalid length was specified for the POKE command.
Use a valid length (either 1, 2, 4, or possibly 8).
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Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e0.htm
https://community.oracle.com/message/9316784
https://community.oracle.com/message/2025568
https://community.oracle.com/message/4497062
https://community.oracle.com/message/1117811
https://community.oracle.com/message/1228927