In the data_engine.log file we are getting the error message:
ciGetCachePath - NIM_ROOT not set!
Environment
UIM 8.x UIM 9.x
Cause
The NIM_ROOT environment variable is not set in the controller configuration (Setup->Environment Tab).
Resolution
.Please set NIM_ROOT=<$nimroot of robot installation> as an environment variable in the controller configuration (Setup->Environment Tab). After changing this, restart the robot so the environment variables are getting reloaded.