[gradsusr] segmentation fault

[Jeff Lake]

anybody tell me why this is throwing a segmentation fault

'define tempc = TMP2m - 273.16'
'define dewc = DPT2m - 273.16'
'define rh = pow(10, (1779.75 * (dewc - tempc) / ((237.3 + dewc) * 
(237.3 + tempc)) + 2))'

as soon as I added this GrADS starting complaining

-- 
-Jeff Lake
MichiganWxSystem.com
WeatherMichigan.net
TheWeatherCenter.net
GRLevelXStuff.com