The colormap can't import successfully on my laptop

[envhyf]

First, thanks for your interesting work.
I have tried to install ncl-cmaps, and type the code as your example. It failed with IndexError: index 2 is out of bounds for size 2 which from the plt.colorbar()

When I delete this sentence, the generated figure was just empty.

What's wrong with my problem. Wish for your reply, thanks!

[hhuangwx]

Could you please give me the detail of the error, such as, which line, what platform you used. And a better method might be trying a new similar package cmaps which is more succinct.