Hi Jessica,
from 8 version & higher you don't need this module , mendix provides built in service for rest service, follow below path
right click on any module>add other>publish/consume rest service
Hi Jessica,
you will have to manually change existing module rest service to new built in rest service.
the path i mentioned is for creating new rest service , you can create new with same configuration as before and do proper testing with new and can delete old module