Traceback (most recent call last):


 "site-packages\calibre\gui2\store\loader.py", line 91, in load_cache


 "site-packages\calibre\gui2\store\loader.py", line 178, in load_object


 "<string>", line 15, in <module>
ImportError: No module named PyQt4.Qt

Traceback (most recent call last):


 "/Users/Library/Python/3.7/lib/python/site-packages/numpy/core/__init__.py", line 24, in <module>

from . import multiarray


 "/Users/Library/Python/3.7/lib/python/site-packages/numpy/core/multiarray.py", line 14, in <module>

from . import overrides


 "/Users/Library/Python/3.7/lib/python/site-packages/numpy/core/overrides.py", line 7, in <module>

from numpy.core._multiarray_umath import (
ImportError: dlopen(/Users/Library/Python/3.7/lib/python/site-packages/numpy/core/_multiarray_umath.cpython-37m-darwin.so, 2): Symbol not found: ___addtf3
