Time Step Less or Equal Zero Error

Hi Everyone, 

 

I am working with Radioss. I use TYPE 7 and TYPE 2 contact for this model (You can see from an image below). I set the Engine file as shown in image below.

In the beginning, Radioss run normally. But later found a problem, Time Step Less or Equal Zero Error.

(Previous model, I set nodal time step in engine file less than zero but Radioss run normally.)

Can anyone take a look into my model what's wrong. what change, I have to make.

 

Thank you in advance.

 

<?xml version="1.0" encoding="UTF-8"?>