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LNGPD is not the same as LNGPD :D

oh, thank you very much!
i can't believe i made such a silly mistake and it cost me so much time.

I've just renamed it and other variables to eliminate all "_" signs. But it is giving the same error message. I'm starting to think there is something wrong with the data series themselves. I'm reuploading the workfile with the new names. It looks like this now: C CORRUPTION COUNTRY LAT90 ...

thank you for your help, here is the workfile.
i enter the parameters in the equation window as i wrote in my initial post.

thank you for your reply!
Yes, there is a variable ln_gdp. It's natural logorythm for gdp per capita for a number of coutries.
Is there something wrong with the name itself?
I'm using eviews 7, by the way

when i try to run TSLS equation, it says that the dependent variable is "not defined". LN_GDP is the dependent variable, there are 3 explanatory variables and 2 instrumental variables I input in "equation specification" ln_gdp c lat_90 lcopen control_of_corruption in "instru...