Cygnus Handler Not Found

I have done a clean installation of Fiware (Orion ContextBroker, MongoDB, Java JDK & Cygnus) on a CentOS 6.9 machine. But i got a problem with Cygnus, i cant get him start. When i try anything, event the Quick Start Guide Test i got the following error :

java.lang.ClassNotFoundException: com.telefonica.iot.cygnus.handlers.OrionRestHandler

Do you know what the problem is? Thanks !

Cygnus log file :

time=2017-08-31T14:17:49.917Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp= | op=main | msg=com.telefonica.iot.cygnus.nodes.CygnusApplication[166] : Starting Cygnus, version 1.7.1.UNKNOWN
time=2017-08-31T14:17:50.070Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=main | msg=com.telefonica.iot.cygnus.nodes.CygnusApplication[289] : Waiting for valid Flume components references...
time=2017-08-31T14:17:50.071Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=start | msg=org.apache.flume.node.PollingPropertiesFileConfigurationProvider[61] : Configuration provider starting
time=2017-08-31T14:17:50.074Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=run | msg=org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable[133] : Reloading configuration file:/usr/cygnus/conf/agent_test.conf
time=2017-08-31T14:17:50.083Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=addProperty | msg=org.apache.flume.conf.FlumeConfiguration$AgentConfiguration[1016] : Processing:test-sink
time=2017-08-31T14:17:50.083Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=addProperty | msg=org.apache.flume.conf.FlumeConfiguration$AgentConfiguration[1016] : Processing:test_sink
time=2017-08-31T14:17:50.083Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=addProperty | msg=org.apache.flume.conf.FlumeConfiguration$AgentConfiguration[1016] : Processing:test-sink
time=2017-08-31T14:17:50.084Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=addProperty | msg=org.apache.flume.conf.FlumeConfiguration$AgentConfiguration[1016] : Processing:test-sink
time=2017-08-31T14:17:50.084Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=addProperty | msg=org.apache.flume.conf.FlumeConfiguration$AgentConfiguration[930] : Added sinks: test-sink Agent: cygnusagent
time=2017-08-31T14:17:50.098Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=validateConfiguration | msg=org.apache.flume.conf.FlumeConfiguration[140] : Post-validation flume configuration contains configuration for agents: [cygnusagent]
time=2017-08-31T14:17:50.098Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=loadChannels | msg=org.apache.flume.node.AbstractConfigurationProvider[150] : Creating channels
time=2017-08-31T14:17:50.108Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=create | msg=org.apache.flume.channel.DefaultChannelFactory[40] : Creating instance of channel test-channel type memory
time=2017-08-31T14:17:50.114Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=loadChannels | msg=org.apache.flume.node.AbstractConfigurationProvider[205] : Created channel test-channel
time=2017-08-31T14:17:50.115Z | lvl=INFO | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=create | msg=org.apache.flume.source.DefaultSourceFactory[39] : Creating instance of source http-source, type org.apache.flume.source.http.HTTPSource
time=2017-08-31T14:17:50.120Z | lvl=ERROR | corr= | trans= | srv= | subsrv= | comp=cygnusagent | op=configure | msg=org.apache.flume.source.http.HTTPSource[113] : Error while configuring HTTPSource. Exception follows.
java.lang.ClassNotFoundException: com.telefonica.iot.cygnus.handlers.OrionRestHandler
    at java.net.URLClassLoader$1.run(URLClassLoader.java:359)
    at java ...