On Prediction and Forecasting Command

[Carlos Alvarado]

Hi everybody!

I am trying to forecast from a panel data model with fixed effects but when I compute:

forecast solve, begin(2016),

Stata gives me the following message:

missing values encountered
Missing values were encountered while attempting to solve the model at time 1965 in panel 1.
Variables lelectric and electric evaluate to missing.
r(416);

Any advise? I don't know what my mistake is...