Can Grads open the netcdf file created in matlab?

[liuzf406]

Dear Grads users,
I created a netcdf data file using matlab, but when I tried to open it in Grads, the error message is following:
 
Scanning self-describing file: isotope.nc 
SDF file has no discernable X coordinate.
 
I just can't find out the reason. 
Any suggestion are much appreciated! 
 
Thanks,
Liu
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