#22 ValueError: negative number cannot be raised to a fractional power

[Robin Green]

Using git master, in Step 7 of calibration, after I press Enter I get:

Traceback (most recent call last):
  File "/bin/calise", line 246, in <module>
    r = main()
  File "/bin/calise", line 180, in main
    CliCalibration(confpath)
  File "/usr/lib64/python2.7/site-packages/calise/calibration/calibration.py", line 198, in __init__
    pct, cbs = self.ValuePassage()
  File "/usr/lib64/python2.7/site-packages/calise/calibration/calibration.py", line 538, in ValuePassage
    self.delta = (valThread.average - self.offset) / (percentage ** 1.372)
ValueError: negative number cannot be raised to a fractional power

This is on Fedora 20.

[Nicolò Barbon]

just guessing right now: did you cover the webcam in the previous step?
If you did, then I'll have to check what's wrong. I'll wait for updates.

[Robin Green]

I already had a config file, I was re-running calibrate, so it auto-completed that step without any user interaction.