Hi @Andre P, The N-BEATSx model needs you to match the number of observations between

Y_df

and

X_df

, for the moment N-BEATSx only operates with exogenous data available at the time of the prediction. For example: calendar variables, predictions of other series. Can you check if

len(X_df)==len(Y_df)+H

, where H is the forecast horizon (n_time_out)?