From the error statement (“not between 0 and 1”) which you are getting during training, it seems that your input data (PV Power) needs to be normalized in the range (0,1) before feeding to the ANN. I have checked the "PVPower.mat" file and data in this file are not normalized. Normalizing input data before training also enhances the performance of the network.
To normalize in that range you can use normalize function.
N = normalize(PVPower,'range')
For more details on normalization you can follow this link:
