Error when accessing the setting icon in the builder

When I try to access the setting via the setting icon in the builder, it shows the below error msg. The experiment file is an old one and I’m trying to make a new version of it. I changed the exp. file name and deleted data, html, git folders and any hidden files before attemting to access the setting.

Traceback (most recent call last):
File “C:\Users\aexge3\AppData\Local\PsychoPy3\lib\site-packages\psychopy\app\builder\”, line 1139, in setExperimentSettings
File “C:\Users\aexge3\AppData\Local\PsychoPy3\lib\site-packages\psychopy\app\builder\”, line 1833, in init
File “C:\Users\aexge3\AppData\Local\PsychoPy3\lib\site-packages\psychopy\app\builder\”, line 515, in init
ctrls = self.addCategoryOfParams(theseParams, parent=page)
File “C:\Users\aexge3\AppData\Local\PsychoPy3\lib\site-packages\psychopy\app\builder\”, line 629, in addCategoryOfParams
File “C:\Users\aexge3\AppData\Local\PsychoPy3\lib\site-packages\psychopy\app\builder\”, line 756, in addParam
File “C:\Users\aexge3\AppData\Local\PsychoPy3\lib\site-packages\psychopy\app\builder\”, line 132, in init
parent, val, order=[‘Field’, ‘Default’])
File “C:\Users\aexge3\AppData\Local\PsychoPy3\lib\site-packages\psychopy\app\”, line 542, in init
raise AttributeError(msg)
AttributeError: The initial value for a ListWidget must be a list of dicts