if it was working previously and now stopped, likely a change in paths could have caused this (also because path management is usually an issue). Being careful in recreating the same environment with the same paths, packages, and versions would likely solve the issue.
In case, use which ctfroot to check whether the function is in your path. Look up where it is otherwise and addpath the directory in which it is contained. That may not be the right way if it is part of private functions of a toolbox, but usually it'd work.
