Here is a screen shot of the error:
To confirm the issue, on the server browser, go to http://localhost/yurbiws/yurbiwebservice.svc99 and it most likely will show you this error page:
If you see the reference to a file ending in _www the culprit is that the installer was unable to delete some temporary files while installing Yurbi.
Go to the C:\Program Files(x86)\yurbi\www\bin directory and you will see one or more duplicate files. Go to Windows Services and stop the Yurbi Master Service. Delete the ones that end in _www
Lastly, restart the Yurbi Master Service and try to login again. The problem should be resolved, however if it does persist, please contact support at https://support.yurbi.com70