Server Error in '/' Application.

The string parameter 'key' cannot be null or empty.
Parameter name: key

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.ArgumentException: The string parameter 'key' cannot be null or empty.
Parameter name: key

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:


[ArgumentException: The string parameter 'key' cannot be null or empty.
Parameter name: key]
   System.Web.UI.StateBag.Add(String key, Object value) +9824750
   System.Web.UI.AttributeCollection.Add(String key, String value) +34
   en_haberDetay.Page_Load(Object sender, EventArgs e) +925
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
   System.Web.UI.Control.OnLoad(EventArgs e) +97
   System.Web.UI.Control.LoadRecursive() +61
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4075.0