[Gretl-users] ARMA with additional regressors - The symbol 'b0' is undefined

[Daniel Bencik]

Dear forum, 
 
when estimating an ARMA(x,y) model on my dataset, I receive a "The symbol 'b0' 
is undefined" error as soon as x > 0, regardless of y, and I have nothing like 
b0 in my dataset. I tried googling, to no avail. What could be the problem? 
 
Best regards, 
Daniel