General Description: The CM_EXCLUDE_XQYQ variable is used to disable the use of output to output flip-flop route-thrus during routing. If this variable is set when running PAR, and is then unset when the design is loaded in FPGA Editor, the following error occurs:
FATAL_ERROR:Ncd:x4kcmclb.c:1158:188.8.131.52 - The environment variable to disable the XQ/YQ and YQ/XQ routethrus is set.
The error is also generated if this variable is not set when running PAR, and is then set when loading the design in FPGA Editor.
Either set or unset the variable to match what was done during PAR.