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Okay. But the syntax itself is correct and has no issues right?

Thank you very much for your help! I really appreciate it :)

Would using logged variables instead of the absolute values help? or is this an issue with my data itself?

I have used all the exogenous variables as instruments along with a few others:

iherd
averagefeedprice
freshlycalvedheiferspric
monthlywage
electricitypurchaseprice
realinterestrate

coffeetea
fruit
breadandcereal
ipop
dummymonth

Yes, the build date is apr 20 2015, EVIEWS 8

I am trying to simultaneously estimate two nonlinear equations using GMM. I have entered in the equations but keep receiving 'error 4194303'. Could you please tell me why I am receiving this error and if my syntax is correct: milkproduction=c(1) +c(2)*farmgateprices +c(3)*averagefeedprice +c(4)*fres...