Which build.gradle file should I choose?

You have to go to this particular directory:
~/workspace/<>-ME_QMONEY/qmoney
and edit the configuration for maven publication in this build.gradle file.

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After you have made the respective changes, you would get a pop-up in the right-side
Asking for a Synchronization in Java Classpath

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You can select the option “Always” and proceed with the next task.