Please provide a solution.........

DNN 4.7 installation gets completed but when u launch the default website it shows the following error:




Server Error in '/DNN' Application.
--------------------------------------------------------------------------------

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.] DotNetNuke.UI.Skins.SkinDefaults..ctor(SkinDefault Type DefaultType) +189 DotNetNuke.Common.Globals.get_DefaultSkin() +31 DotNetNuke.Entities.Portals.PortalSettings.GetPort alSettings(Int32 TabId, PortalAliasInfo objPortalAliasInfo) +2799 DotNetNuke.Entities.Portals.PortalSettings..ctor(I nt32 tabId, PortalAliasInfo objPortalAliasInfo) +82 DotNetNuke.HttpModules.UrlRewriteModule.OnBeginReq uest(Object s, EventArgs e) +2897 System.Web.SyncEventExecutionStep.System.Web.HttpA pplication.IExecutionStep.Execute() +92 System.Web.HttpApplication.ExecuteStep(IExecutionS tep step, Boolean& completedSynchronously) +64