JQuery/JSON Error - [AJAX] Invalid JSON - Server reponse is: -

i trying jquery/json terminal thing: http://terminal.jcubic.pl

i uploaded website , tried example , following error message;

login: demo password: **** [ajax] invalid json - server reponse is:  <br /> <b>warning</b>:  require(json-rpc/json-rpc.php): failed open stream: no such file or directory in <b>/home/u262905308/public_html/examples/json-rpc-service-demo.php</b> on line <b>3</b><br  /> <br /> <b>fatal error</b>:  require(): failed opening required 'json-rpc/json- rpc.php' (include_path='.:/opt/php-5.5/pear') in <b>/home/u262905308    /public_html/examples/json-rpc-service-demo.php</b>  on line <b>3</b><br />