If you changed the package / class of the Codename One application after creating it, you need to change it everywhere both in the project and in codenameone_settings.properties, so we recommend that you never change it.
We do not make this process easy, as you are married to creating a package name. This is used to uniquely identify you in stores and cannot be changed even once the application is sent, so you need to understand that this is not what you should do ... Give the package name a deep look before creating the application!
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