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Thank you!

I did it using a flag, because (I don't know why it doesn't work, because it usually does to me) the callback function does not get the argument sub_once, therefore throwing the error "cb_once needs exactly two arguments", and it is being given one (I don't know why it is not passing the argument, and yes, sub_once is given after the callback function name just as you wrote it).

Anyway, with the flags the problem is solved.

Thank you!