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 188.8.131.52 Quartus version.
How do I fix it?
What OS that you were using?
check if you have any linked 'disabled' components in the system - if yes, try to delete rather than disable the components then system builder.