st: installing ivreg2

[SG Sosa Rubi <sgsr100@york.ac.uk>]

Hello,
I have installed ivreg2 using
ssc install ivreg2
I checked and ivreg2 was install in 
c:\ado\stbplus
in my computer
But, when I try to use this command in Stata7 I have problems!!!

ivreg2 grams3s ages age2s m1 m2 m3 m4 (onset=hcmujr hmujr) 
invalid syntax
r(197)

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