Electronic Module Cooling

Hii, I am Pranav Mahajan from Team Kratos Racing Electric and I have a doubt regarding the fluid physics creation in the CHT Analysis. In it when I apply the Physics behavior, the model setup gives an error.I have attached the snapshot of the error I am facing ,please guide me with proper solution..Thanks.. 

SIMULIA​​​​​Formula Student Electric ​​​​​​​CFD ​​​​​​​Edu ​​​​​​​​​​​​​​