autoload_extension not working

[Zizhen]

Environment:

• Operating System: RHEL 7
• osquery Version: 3.3.2
• osquery-python Version: 3.0.5

The first way to load extension worked for me. However doing:
osqueryi --extension /root/test-osquery/create_table.py --verbose(I tried changing filename to end with .ext)

gives me:
I0312 21:29:56.564863 26086 process.cpp:172] Could not start extension process: /root/test-osquery/create_table.ext
terminating

Am I missing something obvious?