Hi All: When I tried to open a nc file, I got the following error message "use ocean_month_1991_01.nc **TMAP ERR: non-existent or not on line ocean_month_1991_01.nc" I've never seen this type of error before. The nc file was written out by the same program, i.e, GFDL MOM4, and I have no problem opening other nc files except this one. This file has more variables. Does anyone know what the error message meant, and how can I fix the file? Your help is greatly appreciated! Zhen