Searching for help for Matlab FPGA in the loop

[Xrwd]

The FPGA I use is Cyclone V CEFA5U1917N, and Quartus version is 20.1 Lite. When I use the FPGA in the loop function in Matlab, the error shown in the figure appears. Could anyone help  to solve this problem?Thanks a lot.

[sstrell]

The only thing I can think of is that you are using a CLKn pin instead of CLKp.  It may not be the solution, but it's easy enough to try.