i have two independent variables, when i perform the NARDL model in Eviews, it shows the error "error 64 in the encrypted program". Please help me how to resolve this issue"
It is common when parsing out the pos and neg components of your Xt that you will have 'too few' values which have a non-zero difference. Therefore, you'll generate a new series which is essentially a constant. Check all your differences series for this condition.