OSGI warning during the startup of Mendix 5 app (converted from Mendix 4)

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During the startup of a Mendix 5 app which is converted from Mendix 4 I receive the following warning: EventAdmin: Exception during event dispatch [org.osgi.service.event.Event [topic=com/mendix/events/runtime/beforeRunning] | [org.osgi.service.event.EventHandler] | Bundle(webui [84])] (bundle: webui, service: [org.osgi.service.event.EventHandler]) Does anyone knows what this warning means?
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Some apps that have virtual attributes, will get a warning during the startup if they are converted from Mx 4.

Warning: EventAdmin: Exception during event dispatch [org.osgi.service.event.Event [topic=com/mendix/events/runtime/beforeRunning] | [org.osgi.service.event.EventHandler] | Bundle(webui [84])] (bundle: webui, service: [org.osgi.service.event.EventHandler])

Our Expert Services dept. offers the workaround below:

  1. Remove/delete all the virtual attributes from your app
  2. Define all the virtual attributes with another name. (It has to be a different name, so Mendix will see it as a new attribute instead of the old one. The microflow that must be selected can still have the old name.)
  3. Restart your app
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