OTClient opcode error

do you have the code extends opcodes in your source?

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you need to add extended opcode to the server source to make communication with the OTC

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What are you trying to do with certain script? If you could be more specific, you will get proper answer.

Since I haven't got much clue regarding to your issue, while you get an answer, check out these threads which can be useful:
Problem with opcode
Problem with extended opcodes
BUG OTclient extended opcode?

It doesn't mean these post are a solution to your problem, but indeed they will give an idea if you read it correctly.