rwolf2 and ivprobit

[Lanna Ng]

Hi,
I wanted to apply rwolf2 to correct for treatment effect estimation using instrument variable approach. Here is my syntax:
rwolf2 ////
(ivprobit y1 (train1=treat1) treat2 if sex==1, vce(cluster cluster)) ///
(ivprobit y2 (train1=treat1) treat2 if sex==1, vce(cluster cluster)) ///
(ivprobit y3 (train1=treat1) treat2 if sex==1, vce(cluster cluster)) ///
(ivreg y4 (train1=treat1) treat2 if sex==1, cluster (cluster)), ///
indepvars (train1, train1, train1, train1) seed (123) reps(1000)

However, the command was able to produce the corrected p-value of the y1, then the warning "varlist is not allowed".

Can anyone help me to know what happened?
Thank you.