how to resolve "Requested subscript is not in the sparse matrix"

When running the transient response simulation, I get the the above error, when I import a new generation source into DEVICE simulations of a PD.
Any idea what’s causing this or how to fix this?

Hi. I’m not particularly familiar with this error message so can you give me some more details. Are you getting this message when you run the simulation or when you load the generation rate data? Was the generation rate data generated with FDTD?