Hi pratik gupta,
Could you check the error log (App_Data/sitefinity.log) if there is another error thrown right before this one shown below
[TypeInitializationException: The type initializer for 'Telerik.Cms.Web.UrlHelper
It seems that there is another error that prevents the initialization of Telerik.Cms.Web.UrlHelper.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.