Ajax tabPanel dynamically

While creating tabpanels dynamically post back is not working...Its showing error like this

Specified argument was out of the range of valid values.
Parameter name: value

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.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: value

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:

[ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: value]
   AjaxControlToolkit.TabContainer.set_ActiveTabIndex(Int32 value) in c:\AjaxControlToolkit_Admin\Release\AjaxControlToolkit\Tabs\TabContainer.cs:125
   AjaxControlToolkit.TabContainer.LoadControlState(Object savedState) in c:\AjaxControlToolkit_Admin\Release\AjaxControlToolkit\Tabs\TabContainer.cs:387
   System.Web.UI.Control.LoadControlStateInternal(Object savedStateObj) +123
   System.Web.UI.Page.LoadAllState() +8905996
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +747

Ajax tabPanel dynamically

Specified argument was out of the range of valid values.Parameter name: value

Specified argument was out of the range of valid values.
Parameter name: value