Description
Due to a problem in the Intel® Quartus® Prime Pro Edition Software version 19.1, you may see this error during the synthesis stage of compilation.
Resolution
To work around the problem, remove instance assignments that have "auto_fab_0|*" as in the target (-to) field from the QSF (and other scripts sourced by the QSF) file.
This problem is fixed starting with the Intel® Quartus® Prime Pro Edition Software version 20.1.