An error when using gwd_opt in WRFv4.1.3

[wanxh_g]

Hello, everyone!
I encountered a bit of an issue when modifying some parameters in namelist.input in WRF to improve the simulation of wind speed and direction. According to the suggestion, I added the option "gwd_opt". However, after adding "gwd_opt = 1", an error occurred when I was in./real.exe. No matter whether I changed 1 to 0 or 2, an error would still occur. If I deleted this option or commented it out, it could run normally.
I don't understand what caused this error. The version of WRF I'm currently using is WRFv4.1.3, but I also encountered the same error in WRFv4.7.1. Here are the namelist.input file and rsl file I'm using attached

 

[Ming Chen]

gwd_opt should be in the &dynamics section. Please use the namelist.input I attach in this post and try again. Let me know if yous till have issues running your case.

 

[wanxh_g]

Thank you very much! The problem has been successfully solved. Now WRF can run successfully! Thank you again for your help！