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I just went through a long troubleshooting process to correct a similar error.
In my case it was a comment line that had unicode for an em-dash. (The looong dash character.)
Check for any comment lines containing something odd.
Here was the problematic text in my case:

//default uses a step size of 10 degrees, i.e. 0,10,20,30,40,50,60 — 7 points to define the ramp and joined by hull()