UnhandledPromiseRejectionWarning server.start() Gulp 4

[timdiacon]

I'm getting the following warning thrown when I start the server

(node:69565) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 3): Error: Request failed with status code 404

I'm just using a regular gulp function and I've tried returning the the method as shown here, using a then(success, error) approach or a .catch() and nothing seems to get rid o that warning :-(

gulp.task('default', function(){ var server = gls.new('bin/www', {env: {DEBUG:'*'}}); return server.start(); });