ccplot errors

[yinjinfang88 <yin...@16...>]

Dear all,
      I  run ccplot  for visualising CloudSat data. However, I got a error at line 1504 in ccplot file. That is:
        data = cctk.interpolate2d(data, X, Y, (0, e2-e1, e2-e1),
                             (ve1, ve2, resolution), float("nan"), 0, radius)
and the error message is as follows:

Traceback (most recent call last):
  File "/usr/local/bin/ccplot", line 2265, in <module>
    main(sys.argv)
  File "/usr/local/bin/ccplot", line 2183, in main
    opts=opts.plot_opts)
  File "/usr/local/bin/ccplot", line 1505, in plot_profile
    (ve1, ve2, resolution), float("nan"), 0, radius)
TypeError: Cannot cast array data from dtype('float64') to dtype('float32') according to the rule 'safe'

 Did something wrong？ 
Thinks!

     Yin