This is an odd list of steps.
What I did a couple of days ago when faced with this issue was:
- Downloaded existing data from Pavlovia.
- Deleted the project from Pavlovia.
- Closed PsychoPy.
- Deleted all local files and folders from the experiment apart from the psyexp file and resources.
- Opened the psyexp file in PsychoPy.
- Checked that the output path in Experiment Settings was blank.
- Pressed the sync icon to create a new project online.