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When you add a ModuleInstaller class with the Wizard other->Module Development -> Module Installer A new entry: OpenIDE-Module-Install: my/xyz/Installer.class is created in the manifest.mf When you decide to delete the Installer class again since you did not like it - the delete operation doese not remove the entry in the manifest.mf file causing an ClassNotFound error when running the app.
*** Bug 200659 has been marked as a duplicate of this bug. ***
*** Bug 205322 has been marked as a duplicate of this bug. ***
You should check option Safely delete (with usage search)...then will be manifest entry removed.