Problem of connection with HareDB HBase Client

Hi,
I have a shared cluster on seven physical server under HDP 2.1.
I’m trying to install and use HareDB HBase Client to visualize more easily HBase tables.
I Launch the client on my computer to manage HBase on Red Hat Server
I’m filled all the connection field into “Connection Manager” but when I try to connect to Hbase by clicking on the button “Connect”, I have the following error :
“ERROR qtp14440411-16 com.haredb.hbaseclient.ui.rest.resource.RestConnectionService – Exception:”

Have you any idea to resolve this issue ? After contact the support, I have no solution.
thanks in advance for your help.
regards.