AppCode 3.1.7 and Xcode 7 - showing false errors in coding

after installing Xcode 7 and starting an existing project in AppCode, I can see a lot of errors in my coding. The most are like this "Method 'viewWithTag:' is defined in class 'UIView + UIViewHierarchie' and is not visible".
When I start my coding (run or debug) the app starts as expected and no compiler errors comes up. If I change the Xcode version to 6.3.2 the errors are not showing.
Could someone tell me what is going wrong or what can I do to see only right errors?
Thanks a lot,

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