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Your screen shot is barely readable. It is better to post output by copying and pasting from the Results window (or your .smcl file) between delimiters.
In any case, I can see that you are carrying out a fixed-effects regression with 7 predictor variables, but you only have 5 groups. That is the source of your problem.
If you think you should have more than five groups in your data, then check to see what is being left out of the estimation sample due to a missing value on any variable in the model. If you expected only to have five groups, then you will need to drop predictors from your model.
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