In order to make any changes (archiving a project changes its state) to a project you must check it out first. There are a couple reasons for this. First you must have exclusive control over a project before modifying it (i.e. no one else is editing the project at the same time). Also, a physical archive (ZIP file) of the project is created when you archive a project. Checking out the project first ensures that you have all of the latest files on your local machine when the archive file is created.
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