During the default running of case B1850 with CESM2.1.3, I get an error message in cesm.log (ERROR: component_mod:check_fields NaN found in WAV instance: 1 field Sw_lamult 1d g lobal index: 228) after two model years, the error occurred after 0003-01-08 of the model. The previous discussions show that the problem of the ATM/POP instance may originate from the respective forcing data. I used the default initial file (inputdata/wav/ww3/restart.ww3.init.seed), and also manually download and replace the automatically downloaded file, but the error still persists. Looking forward to your reply.