So, you're running on a Mac, right? If this is the case, you might have hit one very specific issue that we have already documented in our known issues
Have you by any chance any items in your project named __MACOSX? If yes, please, make sure to remove them and try building again. These are usually system items, created within archives on a Mac system. These tend to interfere with our build services and might cause a server error. In addition, double-check if you have any folders that do not contain a plugin.xml in them in the Plugins folder.
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