NAV 2013 Webclient- Multiple companies

Hello, i configured NAV2013 successfully with RTC, webclient

am able to open the webclient from other systems in domain with credentials

now i configured 2 companies in my database and assigned to 2 differant users each company in RTC

but when i tried to open the same in web client am getting the error

A server error has occurred, and the content cannot be displayed. Refresh the page or open a new browser window

is there any other setup in web.config to give multiple companies for user wise

please guide me