This check was newly added as part of appinspect 2.1.0 in order to encourage Python3 adoption over Python2.7
Please include the python.version = python3 in the restmap.conf stanzas.
Example:
[admin_external:my_settings]
handlertype = python
handlerfile = file.py
handleractions = edit, list
python.version = python3
If you still encounter issues, please post your restmap.conf file.
... View more