I am running CESM2.2.0 (1850_CAM60_CLM50%CN_SICE_SOCN_SROF_SGLC_SWAV) with a custom compset, and I want to perform a coupled run of CAM and CLM for the data from January to December 2010. However, I encountered this error during the run: Longwave down sent from the atmosphere model is negative or zero. I have uploaded my namelist files for both CAM and CLM, and upon checking the log file, I did not find any other errors except for the one uploaded.