Xcode unable to create new "Window-based application" iphone app from template

I'm trying to create a new "Window-based Application" in Xcode and I'm getting the following message:

Internal Error  
File: /SourceCache/DevToolsIDE/DevToolsIDE-1688/pbxinterface/Wizards.subproj/PBXWizardChooserWizard.m  
Line: 1365  
Object: <PBXProjectWizardChooserWizard:0x200b845e0>  
Method: sheetDidEndWithReturnCode:fileSystemLocations:contextInfo:  

wizard should be an instance inheriting from PBXProjectWizard, but it is nil

This only happens when I select the "Window-based Application" template, all the others are working fine. When I'm on 开发者_如何学编程the New Project screen there's no description available for this template either.

I installed the new SDK for iOS4 yesterday and was having a few issues with files missing so I uninstalled and did a clean install to try and rectify but now I have this error. Not sure if the two events are related.

If anyone has any suggestions as to how to fix this I'd be very appreciative! Thanks

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Figured it out - just a little bug when selecting the product that the new project was to be developed for. By default "iPhone" was selected, when I changed this to any of the other options "iPad" or "Universal" and then back to "iPhone" it seemed to fix itself.

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select the check box "Use Core Data for storage",then deselect it,then the description emerge,and you can create a window-based project now.