Due to a problem in the Intel® Quartus® Prime Pro Edition software version 20.2, you may see this error during the Fitter Plan stage. This fatal error may occur when "Periphery to Core Placement and Routing Optimization" setting is enabled.
A patch is available to fix this problem for the Intel® Quartus® Prime Edition Pro software version 20.2. Download and install Patch 0.15 from the appropriate link below.
Download patch Intel® Quartus® Prime Pro Edition 20.2 Patch 0.15 for Windows (.exe)
Download patch Intel® Quartus® Prime Pro Edition 20.2 Patch 0.15 for Linux (.run)
Download the Readme for Intel® Quartus® Prime Pro Edition 20.2 Patch 0.15 (.txt)
This issue has been fixed in the Intel® Quartus® Prime Pro Edition software version 20.3.