Hi guys

My problem is when configuring Hyper-V, this is the error:
Server Error in '/' Application.

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.]
   SolidCP.Portal.UserControls.EditIPAddressControl.Validate(Object source, ServerValidateEventArgs args) +480
   System.Web.UI.WebControls.CustomValidator.OnServerValidate(String value) +168
   System.Web.UI.WebControls.BaseValidator.Validate() +137
   System.Web.UI.Page.Validate(String validationGroup) +128
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +111
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1734

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1649.1

thx for your help