Zero Plastic strain & Vonmises stress in EPS material

Hi, I'm performing drop simulation on air conditioner with complete packaging. I modelled EPS (Expanded Polystyrene) material with crushable foam model. The run is being killed and showing error message ("Energy error limit reached"). When I checked the results of EPS material, it is undergoing very high deformation which is creating very high energy.

I have two questions.

1) How to avoid energy error ?

2) In EPS material, I'm observing zero plastic strain, VonMises stress even though it is undergoing high amount of deformation. What is the reason for this ?