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)