Cloudmin Java App error (File Manager, SSH login page etc)

I am using Cloudmin Pro; I added a physical system as part of the cloudmin managed systems.
However if you proceed running any java app through -> Webmin servers index -> Click the (System name) -> Then proceed to File Manager of this System, i get a cross on the java app saying there is an error.

Does anyone know what the problem is? Or something I did not config properly?