From the documentation - https://docs.mendix.com/apidocs-mxsdk/mxsdk/creating-your-first-script - "If you create an online working copy from an existing app on the Team Server, be sure your app has been saved using the latest Mendix Desktop Modeler version. Earlier versions might not be supported!" What if my application is not on the latest modeler version? Are my options (1) upgrade or (2) make a copy and upgrade ? Any insights will be helpful.
If you are trying to create a new team server project from existing project package, you can follow the steps in this post.