You may see this error in the Intel® Quartus® Prime Pro software version 18.1 when upgrading the Low Latency 40G IP from Intel® Quartus® Prime Pro software version 18.0 using a priority queue of 8 with flow control.
Device Family: Intel® Stratix® 10
Area: Intellectual Property
Last Modified: September 04, 2018
Version Found: v18.0 Update 2
Bug ID: FB: 585336;
IP: Low Latency 40G 100G Ethernet, Low Latency 40G Ethernet