Receving error while using unity container

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C#

hi everyone,
I am receving an error while injecting the dependencies in my web application.

Server Error in '/WebSite1' Application.

Value cannot be null.
Parameter name: existing

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.ArgumentNullException: Value cannot be null.
Parameter name: existing

Source Error: 


Line 33:                 throw new InvalidOperationException("No Unity container found");
Line 34:             }
Line 35:             container.BuildUp(this as T);
Line 36:         }
Line 37:     }

Source File: C:\Users\Admin\Documents\Visual Studio 2010\Projects\Website1.sln (2)\CRMLibrary\BasePage.cs    Line: 35 

Stack Trace: 


[ArgumentNullException: Value cannot be null.
Parameter name: existing]
   Microsoft.Practices.Unity.Utility.Guard.ArgumentNotNull(Object argumentValue, String argumentName) +63
   Microsoft.Practices.Unity.UnityContainer.BuildUp(Type t, Object existing, String name) +40
   Microsoft.Practices.Unity.UnityContainerBase.BuildUp(T existing) +113
   CRMLibrary.BasePage`1.InjectDependencies() in C:\Users\Admin\Documents\Visual Studio 2010\Projects\Website1.sln (2)\CRMLibrary\BasePage.cs:35
   CRMLibrary.BasePage`1.OnPreInit(EventArgs e) in C:\Users\Admin\Documents\Visual Studio 2010\Projects\Website1.sln (2)\CRMLibrary\BasePage.cs:14
   System.Web.UI.Page.PerformPreInit() +31
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +328

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.225

I don't understand what's the error in it.Please help me.