Command failed with exit code 1: gulp build

[AaronP]

Any devDependencies in your package.json will NOT be installed when Netlify automatically run yarn install or npm install at the beginning of the build.

Try making Gulp a dependency rather than dev dependency?

[Support Guide] Frequently encountered problems during builds

Overview Sites on Netlify can be built using many different tools — differing frameworks, programming languages and approaches. It can be incredibly frustrating to see your site fail to build! If you have a build on Netlify that is failing with an error message that you don’t understand, you are not alone. Here you’ll find some common build failure messages, and probable solutions to the causes. If you’re looking for more general information on build debugging, or interested in details about how…