Sitecore: Could not find property 'DefaultIndexConfiguration' on object of type: Sitecore.ContentSearch.ContentSearchConfiguration [SOLVED]

Solution:

My solutions was to delete the Sitecore.Support.394688.config. Also the corresponding dll is not needen anymore.
This issue appeared while upgrading Sitecore from 7.0 to 7.2!!!
Hope this helps!

Problem:

Server Error in '/' Application.

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Could not find property 'DefaultIndexConfiguration' on object of type: Sitecore.ContentSearch.ContentSearchConfiguration

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: Could not find property 'DefaultIndexConfiguration' on object of type: Sitecore.ContentSearch.ContentSearchConfiguration

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: Could not find property 'DefaultIndexConfiguration' on object of type: Sitecore.ContentSearch.ContentSearchConfiguration] Sitecore.Configuration.Factory.AssignProperties(Object obj, Object[] properties) +1646 Sitecore.Configuration.Factory.AssignProperties(XmlNode configNode, String[] parameters, Object obj, Boolean assert, Boolean deferred, IFactoryHelper helper) +523 Sitecore.Configuration.Factory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert, IFactoryHelper helper) +198 Sitecore.Configuration.Factory.CreateObject(String configPath, String[] parameters, Boolean assert) +298 Sitecore.Configuration.Factory.CreateObject(String configPath, Boolean assert) +38 Sitecore.ContentSearch.Abstractions.FactoryWrapper.CreateObject(String configPath, Boolean assert) +11 Sitecore.ContentSearch.ContentSearchManager.get_SearchConfiguration() +168 Sitecore.ContentSearch.ContentSearchManager.GetIndex(String name) +18 Intranet.Website.Logic.Search.ItemSelector.get_Index() +77 Intranet.Website.Logic.Search.ItemSelector.GetResults(Expression`1 predicate, String sort, Boolean reverse, Int32 start, Int32 count, Boolean neglectPermissions) +7837 Intranet.Website.Logic.Search.ItemSelector.GetItems(BaseSearchParameter param, String sort, Boolean reverse, Int32 start, Int32 count) +4991 Intranet.Website.layouts.sublayouts.buho.Portlets.SearchListPortlet.Page_Load(Object sender, EventArgs e) +4988 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51 System.Web.UI.Control.OnLoad(EventArgs e) +92 System.Web.UI.Control.LoadRecursive() +54 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Control.LoadRecursive() +145 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772

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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18446