"Backrub rotamers for chain" doesn't work

[olibclarke]

Hi Paul,

I tried "Backrub rotamers for chain" in the Modeling toolbar, Coot 1.1.10. Nothing happens, and the attached error is printed to the log:

marked_for_display size() 0
debug:: safe_python_command() PyRun_SimpleString() import fitting
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'fitting'
debug:: safe_python_command() PyRun_SimpleString() fitting.backrub_rotamers_for_chain(0, 'A')
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'fitting' is not defined`

Multiple other items in the Modeling menu also seem non-functional.