I'm using a python to idl bridge in a python script, but get the following error: ModuleNotFoundError: No module named 'pythonidl36'

Question

Added:

import sys
sys.path.append('<IDL_DIR>/lib/bridges')
from idlpy import *

to the python script (3.6) and changed the IDL_DIR to /opt/IDL/bin/ and get the following error(s):

python3 /home/phaines/climate/data/download_stations_test6
Traceback (most recent call last):
  File "/opt/IDL/idl/lib/bridges/idlpy.py", line 29, in <module>
    pyidl = import_module(idllibrary)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'pythonidl36'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/phaines/climate/data/download_stations_test6", line 66, in <module>
    from idlpy import *
  File "/opt/IDL/idl/lib/bridges/idlpy.py", line 43, in <module>
    pyidl = import_module(idllibrary)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named 'pythonidl36'