ValueError: operands could not be broadcast together with shapes (3,) (2,)

OS Mac10:
PsychoPy version 2.10:
**Standard Standalone? y:
**What are you trying to achieve?:
I’m very new to psychopy and to all kinds of programming, but I’m trying to make a digit span test with increasing number of digits in response to correct answers. The experiment is built like this:

and I get it to run up until the first sequence of digits are presented where it
a, presents the digits backwards in respect to how it is in my .xlsx file → Why?
b, then crashes after presenting 2/3 of the span with the following message:

8150.8698 INFO Loaded monitor calibration from [‘2021_01_11 18:15’]
0.9015 WARNING We strongly recommend you activate the PTB sound engine in PsychoPy prefs as the preferred audio engine. Its timing is vastly superior. Your prefs are currently set to use [‘sounddevice’, ‘PTB’, ‘pyo’, ‘pygame’] (in that order).
8.0124 WARNING User requested fullscreen with size [1024 768], but screen is actually [1440, 900]. Using actual size
2021-02-05 11:05:23.721 python[5257:300035] ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to (null)
Traceback (most recent call last):
File “/Users/vivekaekwall/Desktop/DigSpan_Dowload/”, line 517, in
File “/Applications/”, line 1010, in flip
File “/Applications/”, line 818, in draw
GL.glTranslatef(self.posPix[0], self.posPix[1], 0)
File “/Applications/”, line 793, in posPix
File “/Applications/”, line 95, in convertToPix
return unit2pixFunc(vertices, pos, win)
File “/Applications/”, line 69, in _height2pix
return (pos + vertices) * win.size[1]
ValueError: operands could not be broadcast together with shapes (3,) (2,)

Experiment ended.

Very happy if someone could help me out…