No module named '_phash' while running python verify.py

[tonko22]

I followed setup instructions: clone github repo, pip install -r requirements.txt

python verify.py wavs-test.txt phones-test.txt data.idx caused error:

:~/projects/vosk$ python verify.py wavs-test.txt phones-test.txt data.idx Traceback (most recent call last): File "/home/[email protected]/projects/vosk/phash.py", line 14, in swig_import_helper return importlib.import_module(mname) File "/usr/local/lib/python3.7/importlib/init.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "", line 1006, in _gcd_import File "", line 983, in _find_and_load File "", line 965, in _find_and_load_unlocked ModuleNotFoundError: No module named '_phash'

using python 3.7.0, ubuntu 18.04

Couldn't fild answers with google. What could be the problem?