That is saying that the second degrees of freedom of the F(q,n-k) test is not positive. n is the number of observations, and k is the number of regressors, including the constant, 3 in your case. So, it seems that your number of observations is 3 or less. What’s the number of rows of the data frame, after dropping missings? If the screenshot is the entire sample, it is 3, which is in agreement with these comments.