analyzing wage discrimination using oaxaca_rif
However, Some problem have occur.

I did the following
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local i = 10
while `i' <= 90 {
oaxaca_rif lnwage age age2 if fsize==2, by(gender) wgt(1) rif(q(`i'))
local i = `i'+10
}
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then, the following message appeared and it did not execute.
"dropped coefficients or zero variances encountered specify -noisily- to view model estimation output specify -relax- to ingnore "

anyone know how to fix it?