i created a test project with demo tab activity. I have not written a single line of code, everything has been generated by eclips juno and i got -The following classes could not be instantiated: - android.support.v7.app.WindowDecorActionBar error massage ,how to fix it
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I would strongly suggest you move to Android Studio if possible. Eclipse is lagging behind more and more. It's much easier as well as more streamlined. – Acapulco Dec 11 '15 at 16:52
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I have worked with both Eclipse and Android Studio and in all honesty, Android Studio is much better. IntelliJ is another alternative which I worked with once. – myselfmiqdad Dec 11 '15 at 16:58
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Try updating your SDK support library. Often I've encountered errors even with auto-generated classes because my libraries were not updated.

Dimitre Bogdanov
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