If all else fails, perform a clean reinstall.
This error typically appears during software startup, when opening a model, or when attempting to run an analysis. The message indicates that the licensing system (Sentinel RMS, formerly Safenet) cannot verify that a valid license exists for the software on your machine or network. Unlike simple "license expired" messages, Error 30 points to a breakdown in communication between the software and the license server or local license file. license not recognized error 30 etabs 2016