What version of MonoX did you try to install?

I have the same error after install my version  is : MonoX_4_9_40_4907

The error is :

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.]
MonoSoftware.MonoX.Localization.LocalizationHandler.GetDefaultCultureName() +135
MonoSoftware.MonoX.Localization.LocalizationHandler.GetLocalizationCultureName() +622
MonoSoftware.MonoX.Utilities.LocalizationUtility.GetCurrentLanguageCultureName() +23
MonoSoftware.MonoX.Utilities.PageUtility.GetPageProperties(String appRelativeCurrentExecutionFilePath) +103
MonoSoftware.MonoX.BasePage.GetPageProperties() +28
MonoSoftware.MonoX.BasePage.get_PageProperties() +28
MonoSoftware.MonoX.BasePage.OnPreInit(EventArgs e) +53
System.Web.UI.Page.PerformPreInit() +21
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1041

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34237

Hi amrmagdy,

  I have answered on your question in the other thread so we will close this one.

Regards