Error in plotting trend

Hello All,

I am plotting the monthly SST trend of 15 years. But in the plot I am
getting an error saying:
gsn_csm_xy: Fatal: X and Y must have the same dimensions sizes, or one
must be one-dimensional and both have the same rightmost dimension.
I am attaching the script and the plot. Any comment about fixing this will
be very helpful.

Thanks,
Soumik

-- 
*************************************
Soumik Basu
Graduate Student, Research Assistant
International Arctic Research Center
University of Alaska Fairbanks
Fairbanks,Alaska,USA
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