Inverter Design using Simscape

I'm currently trying to design an inverter using simscape library. i'm having issue to simulate the circuit below.

Here is the error screenshot. I dont know how to solve all these.

Answer 1

[Jonas]

You have no load impedance.

You are basically just short circuiting the ideal DC voltage source using your switches.

[Mohd Hilmi Mohd Ghazali]

i did try to put load impedance. but the problem didnt solve :(