Problems using yap in command line (Mac)

I'm trying to use yapf in command line. I've tried uninstalling it and reinstalling it but this keeps popping up every time I try ```yapf whatever```:

```
Traceback (most recent call last):
File "/Users/mylaptop/miniconda3/bin/yapf", line 6, in
from yapf import run_main
File "/Users/mylaptop/miniconda3/lib/python3.7/site-packages/yapf/__init__.py", line 41, in
from yapf.yapflib import yapf_api
File "/Users/mylaptop/miniconda3/lib/python3.7/site-packages/yapf/yapflib/yapf_api.py", line 41, in
from yapf.yapflib import blank_line_calculator
File "/Users/mylaptop/miniconda3/lib/python3.7/site-packages/yapf/yapflib/blank_line_calculator.py", line 26, in
from yapf.yapflib import pytree_utils
File "/Users/mylaptop/miniconda3/lib/python3.7/site-packages/yapf/yapflib/pytree_utils.py", line 29, in
from lib2to3 import pygram
File "/Users/mylaptop/miniconda3/lib/python3.7/lib2to3/pygram.py", line 39, in
pattern_grammar = driver.load_packaged_grammar("lib2to3", _PATTERN_GRAMMAR_FILE)
File "/Users/mylaptop/miniconda3/lib/python3.7/lib2to3/pgen2/driver.py", line 156, in load_packaged_grammar
return load_grammar(grammar_source)
File "/Users/mylaptop/miniconda3/lib/python3.7/lib2to3/pgen2/driver.py", line 131, in load_grammar
g.load(gp)
File "/Users/mylaptop/miniconda3/lib/python3.7/lib2to3/pgen2/grammar.py", line 108, in load
d = pickle.load(f)
_pickle.UnpicklingError: invalid load key, '\x00'.
```