Failed to upload to Pavlovis "unhandled internal error"

OS: Win 10
PsychoPy version : v2020.2.2

What are you trying to achieve?:

I am developing a speech reception threshold program in Builder.

What did you try to make it work?:

It works in standalone Psychopy. I wanted to check that what I’d done so far worked on Pavlovia, but, when I tried to upload to Pavlovia and run, I got the “Psychopy encountered an unhandled internal error…” message with the instruction to report the problem with the details to the developers. There was no indication how it should be reported, so I’m posting it here. The details are below…

Traceback (most recent call last):
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\app\builder\”, line 1232, in onPavloviaSync
retVal = pavlovia_ui.syncProject(parent=self, project=self.project)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\app\pavlovia_ui\”, line 497, in syncProject
syncFrame =
AttributeError: ‘NoneType’ object has no attribute ‘stdOut’

The program is at CullingJ/SRT, but it just gives a 403 error if I try to run it from the URL.

What specifically went wrong when you tried that?:
Include pasted full error message if possible. “That didn’t work” is not enough information.

This is a known bug in 2020.2.2 which is now fixed, you can prevent this quickly by just opening Runner using the Window menu, however if you upgrade to the latest version of PsychoPy (2020.2.4) then this should be fixed.

Thanks for this. The syncing now runs with 2020.2.4.

Unfortunately that seems to lead me to the next problem, which is seems to still be related to the syncing process. The expt. ( hangs at “initialising the experiment.”

I have been trying to investigate. A key thing that seems missing compared to previous experiments is that no “html” folder is created. Why might that not have happened?