systemfunc: cannot create child process:[errno=12]

Can anybody tell the reason for this error
*
fatal:systemfunc: cannot create child process:[errno=12]*
fatal:Execute: Error occurred at or near line 2662 in file
/home/gibies/ncl/mylib/lib_gibies_analysis_module.ncl

fatal:Execute: Error occurred at or near line 22 in file
/home/gibies/ncl/myscripts/skillanal.ncl

The indicated line of the script is
*
 averegion = systemfunc("read var; echo $var")*

-- 
*Gibies George,   CSIR-RF,*
*Monsoon Seasonal Prediction Group,
Climate and Global Modelling Division,
Indian Institute of Tropical Meteorology,
Dr. Homi Bhabha Road,
NCL (P. O.), Pashan,
Pune 411008, India.*
*http://sites.google.com/site/gibiesge/*
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Received on Sat Jun 11 09:40:33 2011