Internal Error: Sub-system: QHD, File: /quartus/comp/qhd/qhd_database_utils_splitter.cpp, Line: 806

Description

Due to a problem in the Quartus® Prime Pro Edition software version 18.1, you may see this internal error when you have illegal global clock assignments in your Quartus Settings File (.qsf).

Resolution

To work around this problem, remove the global clock assignments.