I installed eclipse Juno and android development toolkit(ADT) plugin on that. After installing the plugin, when I try to set preferences for ADT, I get this error:

Unable to create the selected preference page.
An error occurred while automatically activating bundle com.android.ide.eclipse.adt (428).

I used this page as reference for installing plugin:

<http://developer.android.com/sdk/installing/installing-adt.html>

Please suggest something