Due to a problem in the Intel® Quartus® Prime Pro Edition software version 21.1, the fitter error above will be observed when tying to instantiate two or more PCIe IP cores in the Intel® Arria® 10 devices.
This problem is fixed starting with the Intel® Quartus® Prime Pro Edition software version 21.2.
To work around this problem, for the Intel® Quartus® Prime Pro edition software version 21.1, download and install patch 0.08 from the links below. You must install the Intel® Quartus® Prime software version 21.1 before installing this patch.
Download the version 21.1 patch 0.08 for Windows (.exe)
Download the version 21.1 patch 0.08 for Linux (.run)
Download the Readme for the Intel Quartus Prime Pro edition software version 21.1 patch 0.08 (.txt)