After converting MVC 4 project to MVC 5 I am getting an error "this website has redirect loop"

Hello,
After converting MVC 4 project to MVC 5 I am getting an error "this website has redirect loop". In my web.config file I have the following:
<authentication mode="Forms">
<forms loginUrl="~/Account/Register" timeout="2880" />
</authentication>
When I try to click on any menu item, it tries to redirect to /Account/Register page. This was working fine before the conversion. How do I resolve this?

Thanks.