I changed my GRIDDESC but CMAQ cannot read data at all.
Met and GRID data are working well.
I suspect that the way you’ve put the grid description into the GRIDDESC file does not match the units or conventions for grid descriptions. See
https://cjcoats.github.io/ioapi/GRIDS.html#horiz
or
https://www.cmascenter.org/ioapi/documentation/all_versions/html/GRIDS.html#horiz
noting that the correct units are either MKS-compliant distances (i.e., meters, not kilometers) or ISO Standard 6709 compliant latitudes and longitudes (i.e., signed degrees, with -90 <= LON <= LON, -180 < LAT <= 180.
Unfortunately, the error-logging in “subhfile.F” is so screwed up that you can’t tell which item in the GRIDDESC file is the problem. Error logging should always be sufficiently detailed to diagnose such things.