Perhaps you need to check your path to the location of the SDK, this may indicate another location of the SDK where only Android 4.2-API Level 17 is installed.
You can do this by going to Window → Preferences (in your eclipse), in Preferences goto Android, in Android you will see the location of the SDK. Browse and change the location of the SDK to the location of the SDK where your Android SDK tools are installed. For example: C: \ Program Files (x86) \ Android \ android-sdk
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