(novice) much frustration

[R.Patton-00@...]

Hello,
i am having trouble writting what should be a simple piece of code which 
follows...

analyse(0)
runpost()
addcontour(34.8,20.1)
addcontour(-34.8,-20.1)
bendcontour(180,1)
makeplot(2,200,"c:\Documents and Settings\Robert Patton\My 
Documents\work\test1.txt",0)
exitpost()
selectgroup(2)
moverotate(0,0,-8,4)
 
i keep getting stopped with an error message concerning line three which reads 

"error: attempt to call global'addcontour'(a nil value)
stack trace back:
1: main of file ..."

and i cant see what im doing wrong. can anybody please help?

Rob