cs 2007 sql 2005 error

hi ;

i install cs 2007 on sql express edition . setup finish without error but  open
browser  then error

 

Server Error in '/' Application.
--------------------------------------------------------------------------------


The Registration object does not contain a property 'IsCommercial' 
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.InvalidOperationException: The Registration object
does not contain a property 'IsCommercial'

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: 


[InvalidOperationException: The Registration object does not contain a property
'IsCommercial']
  
CommunityServer.Controls.RegistrationPropertyValueComparison.GetPropertyValue(St
ring property) +251
   CommunityServer.Controls.RegistrationPropertyValueComparison.GetLeftValue()
+59
   CommunityServer.Controls.ComparisonConditionBase.get_Result() +14
   CommunityServer.Controls.Conditions.get_Result() +139
   CommunityServer.Controls.WrappedContentBase.DataBind() +76
   CommunityServer.Controls.WrappedContentBase.OnPreRender(EventArgs e) +102
   System.Web.UI.Control.PreRenderRecursiveInternal() +110
   System.Web.UI.Control.PreRenderRecursiveInternal() +193
   System.Web.UI.Control.PreRenderRecursiveInternal() +193
   System.Web.UI.Control.PreRenderRecursiveInternal() +193
   System.Web.UI.Control.PreRenderRecursiveInternal() +193
   System.Web.UI.Control.PreRenderRecursiveInternal() +193
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) +6535


 

help me