error running postzrf.sh

[fipoucat]

I a; getting the following error and wonder what is causing this

? 1
Please wait. NCL is processing ...

warning:toint: A bad value was passed (string); input strings must contain numeric digits, replacing with missing value
fatal:The result of the conditional expression yields a missing value. NCL can not determine branch, see ismissing function
fatal:["Execute.c":8637]:Execute: Error occurred at or near line 1008 in file /home/parallels/work/postwrf-master/modules/contourlvl.ncl

[anikfal]

Can you provide the complete information printed on the screen, including namelist.wrf?