Customization Error

Dear All,

I am creating a new tab on OE Shipment Entry. I achieve the UI that I want, and now I want send post request on a click of a button. Instead, I am getting an error:

Unexpected Error: Your request could not be completed within the time limit. For help increasing the time limit, contact your system administrator about changing the web request timeout setting. 

Status Code: 302 Found

Below are my code.

JS:

Controller C#:

I run it as debug mode.

Is there any extra steps that I need to do?

Thank you.