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When trying to publish the experience :
"localhost:3030 says
Uh-oh! Publish failed. Check the log for errors.
<html>
<head><title> 502 bad gateway</title></head>
<body>
<center><h1>502 bad gateway</h1></center>
</body>
</html> "
the above error occurring while publishing.
It seems that you are using Trial Vuforia Studio. Do you connect to Trial Vuforia Experience Service Server or on-premise VES server?
If you are using trial VES, try a very simple experience and see if it works