 <p>The easiest solution is to create the project in the <strong>default location</strong> in the wizard. Then it just works (as of this writing, but it didn't use to). You can move it to wherever you want at that point.</p> <p><img src="https://i.stack.imgur.com/IFgya.png" alt="enter image description here"></p> <p>You <strong>can</strong> create it in a different folder but then you'll have to:</p> <ul> <li>Edit the modulePath entries in the descriptor.json files to remove the extra path (in my case changed com/test to com/).</li> <li>Remove the bad generated-source folders in the java build path.</li> <li>Add the correct generated-source folders into the java build path.</li> </ul> <p>Which is pointless but included here for completeness. I admit I don't know what I'm doing in the descriptor.json files but it fixed the problem for me.</p>