A build file was modified. Do you want to synchronize the Java classpath/configuration?

A build file was modified. Do you want to synchronize the Java classpath/configuration?
Now | Never | Always.
Getting this like a popup, which option should I select? and what exactly is it?

now, you click on this one

Hey, it’s not a problem, you can go ahead with the development part
just click on always.

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This popup means you changed some content of build.gradle file and the module needs to reconfigure (like download dependency, changes in module settings). You can click on always. That’ll reconfigure automatically whenever you change the build.gradle file.