Add disclaimer on dashes in organization name

Author: weirdwater

content/en/docs/howto/extensibility/pluggable-widgets/create-a-pluggable-widget-one.md

@@ -83,6 +83,12 @@ The generator will ask you a few questions during setup. Answer the questions by
 * Unit tests: **No**
 * End-to-end tests: **No**
 
+{{% alert color="warning" %}}
+At this time the **Organization Name** cannot include a dash "`-`" character. This will result in an  error when running your app, asking to check if the widgets "were  generated with the latest version of the pluggable-widgets-tools and are ES6 modules."
+
+To fix this in an existing widget, modify the `packagePath` property of its `package.json` file and rebuild the widget.
+{{% /alert %}}
+
 {{< figure src="/attachments/howto/extensibility/pluggable-widgets/create-a-pluggable-widget-one/generatorblack-new.png" alt="The Mendix Widget generator with the prompts answered according to the list above." class="no-border" >}}
 
 As part of the widget scaffolding, the generator builds the widget for the first time. You can do this yourself by running `npm run build` inside your widget's directory.