Android - The active editor does not contain a main type.

When you try to run you Android app in Eclipse using the keyboard shortcuts and you face the "The active editor does not contain a main type" error then simply go ahead and uninstall Android ADT form Eclipse (About / Installation Details, uninstall Android Development Tools), then re-install it from the original source (https://dl-ssl.google.com/android/eclipse/). All other settings, like run configuration and source location, did not help me.

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