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If you don't think about what you are doing and/or if you don't have the insight into the fact that some parts of the Base IDE component are essential for the application lifecycle, you may easily end up uninstalling Base IDE. The uninstallation completes successfully, unfortunatelly ;) and the only thing you can do then is to uninstall and reinstall the whole IDE.
Should be resolved *somehow* for beta1. We have to think about the way how to do it.
*** Issue 99546 has been marked as a duplicate of this issue. ***
After integrating issue 110566 this problem was fixed. Platform modules cannot be uninstalled. If a module become highly important can be marked in its manifest as AutoUpdate-Essential-Module what cannot by removed nor disabled in IDE.