Object reference not set to an instance of an object.(asp.net mvc)

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开发者_开发知识库 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:

Line 733: } Line 734: Line 735: private static bool mAppDebug = WebConfigurationManager.AppSettings["AppDebug"].ToLower().Contains("true"); Line 736: public static bool AppDebug Line 737: {

Source File: T:\MyProject\IMI03\Helper\IMISecurity.cs Line: 735

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.] IMI03.Helper.IMIApplication..cctor() in T:\MyProject\IMI03\Helper\IMISecurity.cs:735

[TypeInitializationException: The type initializer for 'IMI03.Helper.IMIApplication' threw an exception.]

IMI03.Helper.IMIApplication.set_PasswordDay(Int32 value) in T:\MyProject\IMI03\Helper\IMISecurity.cs:683

IMI03.MvcApplication.Application_Start() in T:\MyProject\IMI03\Global.asax.cs:52

Couldn't find the erro... what kind of error and how to recitfy it...please??

The "AppDebug" setting likely doesn't exist, so calling ToLower() on it is throwing a NullReferenceException. Make sure you've spelled everything correctly and that the setting is actually there.