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### Error object

When an error has occurred on an OpenXM server, an error object is pushed to the stack instead of a result of the computation. The error object consists of the serial number of the SM command which caused the error, and an error message.

    [340] ox_launch();
    0
    [341] ox_rpc(0,"fctr",1.2*x);
    0
    [342] ox_pop_cmo(0);
    error([8,fctrp : invalid argument])

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