Server Error in '/' Application.
Object reference not set to an instance of an object.
Issue: while accessing the SharePoint 2013 site we get the error below.
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.]
Microsoft.SharePoint.Utilities.SPUtility.RedirectToAccessDeniedPage(HttpContext
context) +66
Microsoft.SharePoint.Utilities.SPUtility.HandleAccessDenied(HttpContext
context) +759
Microsoft.SharePoint.IdentityModel.SPFederationAuthenticationModule.OnEndRequest(Object
sender, EventArgs eventArgs) +1197
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+181
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously) +164
Solution:
Please follow the below steps to resolve the issue.
1. Ensure the Root site(/) is created for the web
application.
I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.