NARX Close loop error

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Hi Everyone

I'm trying to solve a NARX problem which is the forecasting of electricity prices in the spot markets (target) using Wind, Solar forecast, as well as auctioned electricity prices as inputs.

I get fairly good MSE and regresseion while training but I'm unable to run it closed loop. Basically what I want is to used the trained neural network to do a prediction for the next 24 hours (divided into 15 min series). All the data is in evenly spaced in 15min slots.

Specifically, I am unable to get the closed loop narx (sample script) code working. Anyone with a simple exam of even a small data set would be extremely helpful. Here's the error that I get.

Error using network/sim (line 267) Number of inputs does not match net.numInputs.

Thanks