Unable to run the study online (with pavlovia.org) - PsychoPy Builder (v2023.2.3)

I am trying to build a study for my Master’s research project.

However, I am encountering great difficulties in running the study online with pavlovia.org.

I have already successfully linked pavlovia.org with PsychoPy Builder (v2023.2.3). However, after building the study flow on PsychoPy Builder, when I click on the "Run the study online (with pavlovia), I get the following error message:

“PsychoPy encountered an unhandled internal error! Please send a report under “Details” to the developers with a description of what you were doing with the software when the error occurred.”

Please see the full error message DETAILS below (and attached to this message):
Traceback (most recent call last):
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\builder\builder.py”, line 1445, in onPavloviaSync self.fileExport(htmlPath=htmlPath)
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\app\builder\builder.py”, line 846, in fileExport exportPath = self.generateScript(experimentPath=exportPath,
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\scripts\psyexpCompile.py”, line 91, in generateScript compileScript(infile=exp, version=None, outfile=filename) File “C:\Program Files\PsychoPy \lib\site-packages\psychopy\scripts\psyexpCompile.py”, line 229, in compileScript
make Target(thisExp, outfile, targetOutput) File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\scripts\psyexpCompile.py”, line 202, in makeTarget
script = thisExp.writeScript(outfile, target=targetOutput, modular=True) File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\experiment_experiment.py”, line 356, in writeScript self_copy.flow.writeFlowSchedulerJS (script)
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\experiment\flow.py”, line 390, in writeFlowScheduler/S for resource in self.exp.getResourceFiles():
File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\experiment_experiment.py”, line 1114, in getResourceFiles
thisFile= getPaths(thisParam.val ) File “C:\Program Files\PsychoPy\lib\site-packages\psychopy\experiment_experiment.py”, line 1032, in getPaths
thisFile[‘rel’] = os.path.relpath(filePath, srcRoot) File “C:\Program Files\PsychoPy\lib\ntpath.py”, line 703, in relpath
raise ValueError(“path is on mount %r, start on mount %r” % (
ValueError: path is on mount ‘G:’, start on mount 'C:

What I have tried to do so far:

  1. I looked through this forum and Google to see whether a similar error occurred with anyone else.

  2. I uninstalled the PsychoPy software and reinstalled it again using the latest update to date.

  3. I reconnected PsychoPy with pavlovia

  4. I tried installing PsychoPy via Python using the command prompt

I would highly appreciate if someone could point me in the right direction as I can’t move forward with my project until I manage to sort this out.

Many thanks.