Just in case, here is the fully error:
Traceback (most recent call last):
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\app\builder\builder.py", line 2265, in onPavloviaSync
self.fileExport(htmlPath=self._getHtmlPath(self.filename))
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\app\builder\builder.py", line 1682, in fileExport
target="PsychoJS")
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\app\builder\builder.py", line 2241, in generateScript
psyexpCompile.compileScript(infile=self.exp, version=None, outfile=experimentPath)
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\scripts\psyexpCompile.py", line 51, in compileScript
script = thisExp.writeScript(outfile, target=targetOutput, modular=True)
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\experiment\_experiment.py", line 200, in writeScript
self.settings.writeInitCodeJS(script, self.psychopyVersion, localDateTime, modular)
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\experiment\components\settings\__init__.py", line 494, in writeInitCodeJS
self.prepareResourcesJS()
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\experiment\components\settings\__init__.py", line 483, in prepareResourcesJS
resourceFiles = self.exp.getResourceFiles()
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\experiment\_experiment.py", line 799, in getResourceFiles
thisFile = getPaths(thisParam.val)
File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\experiment\_experiment.py", line 724, in getPaths
if os.path.isfile(thisFile['abs']):
File "C:\Program Files (x86)\PsychoPy3\lib\genericpath.py", line 30, in isfile
st = os.stat(path)
ValueError: stat: path too long for Windows