iphone提交几次了总是说证书错误，真不知道错什么地方了？

Dear developer,
We have discovered one or more issues with your recent delivery for "xxxx". To process your delivery, the following issues must be corrected:
Invalid Signature - Make sure you have signed your application with a distribution certificate, not an ad hoc certificate or a development certificate. Verify that the code signing settings in Xcode are correct at the target level (which override any values at the project level). Additionally, make sure the bundle you are uploading was built using a Release target in Xcode, not a Simulator target. If you are certain your code signing settings are correct, choose "Clean All" in Xcode, delete the "build" directory in the Finder, and rebuild your release target.
Once these issues have been corrected, go to the Version Details page and click "Ready to Upload Binary." Continue through the submission process until the app status is "Waiting for Upload." You can then deliver the corrected binary.
Regards,
The App Store team

参照的这个教程申请的发布证书， http://my.oschina.net/joanfen/blog/133624，试了几次了，的确不知道问题出什么地方了。