Shine on app integration into Shopify problem

[Shineonuser]

Hi All,

I'm trying to integrate the Shine On app into my Shopify account from these pages https://shineon.com/pages/sellers?r=awwwards  https://shineon.com/pages/install-app?r=awwwards but keep getting this error message each time: 

Sorry, The requested URL https://fulfillment.shineon.com/auth/shopify-redirect was not found on this server.

Does anyone know how to resolve this issue?

Thank you!