Jitsi Hammer failed to start

[nam1665]

After clone and run this command: sudo ./jitsi-hammer.sh -BOSHuri https://mydomain/http-bind -XMPPdomain mydomain -BOSHhost domain -MUCdomain conference.mydomain -users 20 -ivf resources/big-buck-bunny_trailer_track1_eng.ivf -room 1

Hammer cannot start and the log show: log4j:WARN No appenders could be found for logger (org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager). log4j:WARN Please initialize the log4j system properly. org.jivesoftware.smack.SmackException: Timeout reached for the connection to null:0. at org.jivesoftware.smack.bosh.XMPPBOSHConnection.connectInternal(XMPPBOSHConnection.java:200) at org.jivesoftware.smack.AbstractXMPPConnection.connect(AbstractXMPPConnection.java:377) at org.jitsi.hammer.FakeUser.start(FakeUser.java:396) at org.jitsi.hammer.Hammer.startUsersAnonymous(Hammer.java:416) at org.jitsi.hammer.Hammer.start(Hammer.java:342) at org.jitsi.hammer.Main.main(Main.java:281) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293) at java.lang.Thread.run(Thread.java:748) Stopping Jitsi-Hammer... Exiting the program...

Can you tell me how to fix that? Thank you so much.