This error is not actually related to the servo motor in any way. The actual problem is that there is a “bad” character in the file. It is a type of error that we have heard of before, but not been able to reproduce. If you can follow up on our earlier reply to you and send us a copy of the file, then hopefully we can solve this once and for all. If not, you might try using one of our example files while doing your calibrations.