DMA 游戏中出现错误

I have been using DMA to play games for a long time. During that time, the loader crashed, and when I restarted, the loader would start up again. However, this time, the error message "The FPGA device [0, v0.0, 0000] failed to connect to the memory acquisition device" appeared in the DMA tester. I had never encountered this problem before, and it had been working fine. The sub-PC and the main PC are connected, but I am having trouble with the above error.