List indices must be integers or slices, not float: error only second time referring to parameters, not first

[wakecarter]

In that case there might be blank rows in your spreadsheet, especially if the error doesn’t come up on the first trial.

TypeError: list indices must be integers or slices, not NoneType

Windows 10 v2021.2.3 I would like to present two grating stimuli that vary in orientation and opacity each trial in a randomized loop. The one on the left is called patchLeft The one on the right is call patchRight. The participant will be asked about either the orientation or the opacity (ex: which patch leans further to the right?), and will have a chance to respond. The orientation and opacity used will be different for each participant, and will be entered prior to each experiment into the…