dim_sum_n error in ncl 5.1.1

Hi. I just ran into something strange.
I have NCL v. 5.1.1 installed. I just tried using the dim_sum_n_Wrap
function in a script and I'm getting an error it doesn't exist.
But it was working fine a couple of days ago.
The dim_sum_n function is working

Here is a command line example.
what could cause this?
-Erik
/home/eunoble/local_erik/bin/ncl
DI:/discover/nobackup/eunoble/myWorkDir/OUTPUT> ncl
 Copyright (C) 1995-2009 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 5.1.1
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
ncl 0> example = dim_sum_n_Wrap(x,0)
fatal:Undefined identifier: (dim_sum_n_Wrap) is undefined, can't continue
fatal:Execute: Error occurred at or near line 0

ncl 1> example = dim_sum_n(x,0)
fatal:Variable (x) is undefined
fatal:Execute: Error occurred at or near line 1

http://www.ncl.ucar.edu/Document/Functions/Contributed/dim_sum_n_Wrap.shtml
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Received on Sat Nov 7 22:11:49 2009