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My Psychopy sopped running

Hello
I installed psychopy3 a couple of weeks ago. All of a sudden it sopped working. I reinstalled it several times but it does not working. I applied the command:
python -c “from psychopy import prefs; print(prefs.paths[‘userPrefsDir’])”
Here is the output of Command Prompt.

“C:\Program Files\PsychoPy3\python.exe” -m psychopy.app.psychopyApp
Traceback (most recent call last):
File “C:\Program Files\PsychoPy3\lib\runpy.py”, line 183, in _run_module_as_main
mod_name, mod_spec, code = _get_module_details(mod_name, Error)
File “C:\Program Files\PsychoPy3\lib\runpy.py”, line 109, in get_module_details
import(pkg_name)
File "C:\Program Files\PsychoPy3\lib\site-packages\psychopy_init
.py", line 44, in
from psychopy.preferences import prefs
File "C:\Program Files\PsychoPy3\lib\site-packages\psychopy\preferences_init
.py", line 13, in
from . import preferences as prefsLib
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\preferences\preferences.py”, line 263, in
prefs = Preferences()
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\preferences\preferences.py”, line 67, in init
self.loadAll()
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\preferences\preferences.py”, line 166, in loadAll
self.appDataCfg = self.loadAppData()
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\preferences\preferences.py”, line 220, in loadAppData
encoding=‘UTF8’, configspec=appDataSpec)
File “C:\Program Files\PsychoPy3\lib\site-packages\configobj.py”, line 1229, in init
self._load(infile, configspec)
File “C:\Program Files\PsychoPy3\lib\site-packages\configobj.py”, line 1318, in _load
raise error
configobj.ConfigObjError: Parsing failed with several errors.
First error at line 157.

How can I fix the problem. Can anyone guide me?

Sincerely,
Mahdi