No login page after installation on centos 7

[kam...@gmail.com]

I install magnus billing version 6 on centos 7. The installation process end successfully but when i open the login page on the browser, it stops on the loading logo like this:

When i use developper console of the browser i have this error:

unreachable code after return statement   app.js:1:353413

/mbilling/blue-neptune/app.js?_dc=20170807175216

SyntaxError: missing variable name   app.js:1:769644

/mbilling/blue-neptune/app.js?_dc=20170807175216