How to simulate a SAR image for RISAT SLC data

I want to simulate a layover-shadow mask for RISAT SLC data. I have imported the C11 bin image into SNAP and the following error is shown. Is there any way to overcome this error.

Hi Sai,
I am also working with the SAR Simulation TC and am having difficulties. Have you been able to make progress with it? If so, I would be happy to discuss.
Thank you very much,