Due to a problem in the Intel® Quartus® Prime Pro Edition software version 19.1 and 19.2, you may see the above internal error at Fitter stage.
A patch is available to fix this problem for the Intel® Quartus® Prime Pro Edition software version 19.1 and 19.2. Download and install Patch from the appropriate link below.
Download patch Intel® Quartus® Prime 19.2 Patch 0.11 for Windows (.exe)
Download patch Intel® Quartus® Prime 19.2 Patch 0.11 for Linux (.run)
Download the Readme for Intel® Quartus® Prime 19.2 Patch 0.11 (.txt)
Download patch Intel® Quartus® Prime 19.1 Patch 0.32 for Windows (.exe)
Download patch Intel® Quartus® Prime 19.1 Patch 0.32 for Linux (.run)
Download the Readme for Intel® Quartus® Prime 19.1 Patch 0.32 (.txt)
This problem has been fixed beginning with the Intel® Quartus® Prime Pro edition software version 19.3.