ValueError: length of metavar tuple does not match nargs

[doggo404]

doggo404@DESKTOP-D45GQ3L:~/musicscan$ ./musicscan-cli
Traceback (most recent call last):
File "./musicscan-cli", line 449, in
main()
File "./musicscan-cli", line 272, in main
formatter_class=fmt
File "/usr/lib/python2.7/argparse.py", line 1617, in init
help=_('show this help message and exit'))
File "/usr/lib/python2.7/argparse.py", line 1310, in add_argument
raise ValueError("length of metavar tuple does not match nargs")
ValueError: length of metavar tuple does not match nargs