eofunc and eof_ts

Hi all,
      I want to get first 3 EOFs from my data. While doing this am getting
error message like:

sub drveof: ier,jopt= 10 0 returned from vcmssm/crmssm
warning:eofunc: 10 eigenvectors failed to converge
warning:eofunc_ts: 2 eigenvectors failed to converge

Please find the attachment for my ncl script. Am using ncl version 6.1.0.
Help me to fix this issue.

Thanks in advance,
Ipsita

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