How to use Form Components, I use form and meet a problem

[wakecarter]

Here are some suggestions about that error.

UnboundLocalError: local variable 'trialList' referenced before assignment

OS (e.g. Win10): mac 10.15.4 PsychoPy version (e.g. 1.84.x): 2020.1.2 Standard Standalone? (y/n) If not then what?: y What are you trying to achieve?: I have this old exp that I can still run [github link removed after problem solved ]. I just refactored it: the stimuli are slightly different, but I meant to use the same paradigm [github link removed after problem solved ]. I copied the .psyexp file over, and when I run it, psychopy crushes after instruction presentation and gives me 2020-…