As Ray mentioned 

from odoo.sh >  shell  we rstarted the http service to get odoo interface back after "Internal Server Error"  message appeared

odoosh-restart http

Hi,

In Odoo.sh you just need to add the modules to corresponding git branch, once you make the commit to the branch, a new build will automatically get created in the odoo.sh.

What you have to do is, commit the module to git branch, open the new build, update the apps list and search and install the module.

Thanks