Simulation for Metamaterials

[Noah_Aus]

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:

However, when I run the simulation, it failed and returned the following error information:

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?