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SOLVED!
For anyone else having this error. Your main and build port numbers, in settings, MUST BE DIFFERENT!

I tried using a different port and the 32 bit version but I still get this error

Error: listen EADDRINUSE 127.0.0.1:4237
 at Object.exports._errnoException (util.js:856:11)
 at exports._exceptionWithHostPort (util.js:879:20)
 at Server._listen2 (net.js:1234:14)
 at listen (net.js:1270:10)
 at net.js:1379:9
 at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:63:16)
 at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:82:10)

I'm trying to use superpowers for the first time but when I start it the console gives me this error no matter what port I use:

Error: listen EADDRINUSE 127.0.0.1:80
 at Object.exports._errnoException (util.js:856:11)
 at exports._exceptionWithHostPort (util.js:879:20)
 at Server._listen2 (net.js:1234:14)
 at listen (net.js:1270:10)
 at net.js:1379:9
 at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:63:16)
 at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:82:10)