title: Reading GRiB2 files using NCTOOLBOX in Matlab,
body: <p>I try to open CFSR gridded binary edition 2 (grb2) precipitation file downloaded from ucar.edu using NCTOOLBOX. However I got error messages:</p>
  
  <pre><code>"nc=ncgeodataset('prate.gdas.200812.grb2')
  Error using ncdataset (line 91)
  Failed to open prate.gdas.200812.grb2
  
  Error in cfdataset (line 59)
          obj = obj@ncdataset(url);
  
  Error in ncgeodataset (line 74)
          obj = obj@cfdataset(url);
  
  Caused by:
      Undefined variable "ucar" or class "ucar.nc2.dataset.NetcdfDataset.openDataset".
  </code></pre>
  
  <p>Can anyone please debug what is going on here?</p>