Sync Error: AttributeError: 'NoneType' object has no attribute 'project'

Builder
1

URL of experiment: https://pavlovia.org/run/t_s/24drb_erw3b

Description of the problem: While creating a new project on Pavlovia i get the following error message
“Traceback (most recent call last):
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\app\pavlovia_ui\project.py”, line 161, in submitChanges
self.parent.project = self.project
AttributeError: ‘NoneType’ object has no attribute ‘project’”

Once i click okay, it seems to sync the project and i can start it from Pavlovia. However, it only goes as far as the instructions and then the first stimulus, after which i get the following error message:
“ReferenceError: experiment is not defined”

If i open the console on chrome i see this as the last message
“ReferenceError: experiment is not defined
at Scheduler._currentTask (24drb_erw3b.js:2319)
at Scheduler._runNextTasks (util-2021.1.4.js:1560)
at Scheduler._runNextTasks (util-2021.1.4.js:1564)
at Scheduler._runNextTasks (util-2021.1.4.js:1564)
at update (util-2021.1.4.js:1514)”

I have tried the fixes mentioned on some of the other threads like deleting the project and creating it again, and cleaning out the preferences. I also checked the custom code in the experiment, and as far as i can tell it is alright, i.e. i have used some of the code in previous experiments, whcih worked perfectly well. Additionally, the program complies both js and python scripts offline without any error messages.

I would really appreciate any help. Thank you for reading :slight_smile:

2

Have you also tried removing the .git folder in your experiment folder?

3

thanks for your reply.
yes. when i deleted the experiment from pavlovia, i also deleted the .git folder and other associated files (the ‘.gitgnore’ and the html file as well), before i re-uploaded the project on pavlovia

4

Strange! Could you share your gitlab repo? My username is tpronk, see this page for a little guide. Searching for experiments on Pavlovia — PsychoPy v2021.1

5

done!
really appreciate your help :slight_smile:

1 Like
6

I forked your experiment to my account, then synced it up with my device, made a trivial change, and committed that to Pavlovia. All went without problems. I’m afraid I can’t reproduce the problem, but I’ve got two suggestions for workarounds:

  • I’ve heard of cases where uninstalling and reinstalling PsychoPy solved it. Maybe try that?
  • I made you a maintainer of my fork. You could consider searching for my fork, and syncing that to a new folder on your hard drive. If working with that one doesn’t cause any issues, then maybe just do it like that?
7

thanks for the suggestions. unfortunately none of them worked. Uninstalling and re-installing PsychoPy did not work. I also tried to pilot your forked version, and got the same error.
I then made a simple experiment (consisting of an instruction disply and 1 stimulus display with some code) to test whether the problem was experiment specific or something more general.
I got exactly the same error while trying to upload it to Pavlovia!

Edit: i also tried running the experiment from a different machine (windows 10) withe the same Version of Pavlovia newly installed (2021.1.4), but it gives me the same error

8

Then I’m not really sure how to fix it. I just recategorized your post to builder in order to see if experts in that area could help us out.

9

Thanks for the help! .
I uninstalled PsychoPy, emptied the cache and all temporary files, re-installed, and built the experiment again. And just tried it again just now, and it works!
So i think something to do with completely removing any temporary files or so!

10

Happy it’s solved. Good luck with your study!