After the Greenhopper installation, the GreenHopper module appears under Administration but when attempting to click on GreenHopper License, the page displays a stacktrace with 404 error.
Screenshot of the problem:
The following stacktrace appears in the log file:
You had disabled several modules in the GreenHopper plugin. You can locate this via Administration > System > Plugins > GreenHopper.
Enable all the modules under GreenHopper via Administration > System > Plugins.