The SIM4Life Light version deals with meshing during simulation

I found in the process of practical software simulation, I import yoon sun model, in the process of meshing, appear error warning, so I will model the AXES of gird enlarge the SIZE to contain yoon after the SIZE of the sun, meshing is not an error, but can't create voxels, I don't know what this is due to the reasons for this, I now use the sim4life lightb version, I think only of regional human model simulation, However, I do not know whether the influence of blood perfusion still exists if only the regional human model is simulated! Hope to get your help, thank you very much.