json_prolog cpp client error ?!

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Hi,

I try to call json_prolog cpp client, and get that error

amal@amal-HP-G62-Notebook-PC:~/ros/stacks/knowrob/json_prolog/bin$ ./object_positions
terminate called after throwing an instance of 'json_prolog::PrologQueryProxy::ServerNotFound'
  what():  No connection to the json_prolog server.
Aborted (core dumped)
amal@amal-HP-G62-Notebook-PC:~/ros/stacks/knowrob/json_prolog/bin$ roswtfLoaded plugin tf.tfwtf
Package: json_prolog
================================================================================
Static checks summary:

Found 1 error(s).

ERROR The following packages have rpath issues in manifest.xml:
 * json_prolog: found flag "-L/opt/ros/fuerte/lib", but no matching "-Wl,-rpath,/opt/ros/fuerte/lib"
 * rosjava_jni: found flag "-L/opt/ros/fuerte/lib", but no matching "-Wl,-rpath,/opt/ros/fuerte/lib"
 * roscpp: found flag "-L/opt/ros/fuerte/lib", but no matching "-Wl,-rpath,/opt/ros/fuerte/lib"
 * roslib: found flag "-L/opt/ros/fuerte/lib", but no matching "-Wl,-rpath,/opt/ros/fuerte/lib"
 * std_msgs: found flag "-L/opt/ros/fuerte/lib", but no matching "-Wl,-rpath,/opt/ros/fuerte/lib"

================================================================================
Beginning tests of your ROS graph. These may take awhile...
analyzing graph...
... done analyzing graph
running graph rules...
ERROR: connection refused to [http://amal-HP-G62-Notebook-PC:60818/]
... done running graph rules

Online checks summary:

Found 4 error(s).

ERROR Communication with [/rosout] raised an error: 
ERROR Could not contact the following nodes:
 * /fridge_handle

ERROR The following nodes should be connected but aren't:
 * /fridge_handle->/rosout (/rosout)

ERROR Errors connecting to the following services:
 * service [/fridge_handle/get_loggers] appears to be malfunctioning: Unable to communicate with service [/fridge_handle/get_loggers], address [rosrpc://amal-HP-G62-Notebook-PC:41882]
 * service [/fridge_handle/set_logger_level] appears to be malfunctioning: Unable to communicate with service [/fridge_handle/set_logger_level], address [rosrpc://amal-HP-G62-Notebook-PC:41882]

Thanks