Hi, I got the following Error when I tried to open my top level QSYS design: Error: An unexpected error occurred during Open System: java.lang.NullPointerException Debug: java.lang.NullPointerException

I have a top level QSYS with two QSYSes included. When I tried to rename some of the internal QSYS export ports, I got this error in the top-level QSYS. I use 18.1.0.222 Quartus version. How do I f...