Code signing error on iOS Simulator

I am using XCode 3.2.6 with iPhone Simulator 4.3 but when i run build and run this app on iPhone Simulator it throws error

Code Sign error: The identity 'iPhone Developer' doesn't match any valid certificate/private key pair in the default keychain

I got to know about this error when i am using Interface Builder->Build and go to XCode then it shows error and when c开发者_如何学运维ompiled using XCode it just shows a blank screen on iPhone Simulator.

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It may be helpful to you.

   1. Select the target under Groups & Files
   2.Click the Get Info button
   3.Choose the Properties tab
   4.Under Identifier, make sure it says com.YOURREALCOMPANYNAME.APPNAME

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Check whether you have created proper developer profile and installed it in Keychain. Lso check your bundle identifier

Hope it works....