I have problems deploying a project to the cloud for the first time (5.13.0). When deploying to the cloud i get the error: 'Whoops something went wrong while deploying to the Sandbox.' When I then press 'View app' my browser shows a Mendix error: 'internal server error. An unexpected exception occurred while handling request login'. If i remove the extra login credentials from the URL i do get a login screen. But since I do not have any users yet I can not log in. Another Sandbox project i have seems to be deploying/running again as it used to.
Turned out the problem was caused by some of my (imported) java libraries. Apparantly some were duplicated.