Dear Support,

Currently I am using Sim4life (version V 4.4.2.3851) for simulation dielectric materials with negative permittivity. My setting is shown below:
cb366c59-1f0c-4869-a4e1-11acec860519-image.png

However, when I run the simulation, it failed and returned the following error information:
daf851bf-dcc5-4c4e-b9d9-dc5931c60d3d-image.png
Could you help me with it?

Another question is that I found on this website(https://zmt.swiss/sim4life/physics-models/p-em-fdtd/) that sim4life can simulate Metamaterials with double negative properties(see below for screen capture), however it seems I can only set permittivity as negative and cannot set permeability as negative value. Is it because the version is updated? (I can see V 5.0 was released few days ago) Or we cannot set permeability as negative in sim4life yet?
6db15893-51c9-450f-b0e5-84e1baa77d2b-image.png