server stopped working

[jamelkhiareddine]

Hey,
I have installed transitclock with our GTFS feed and it working fine but sometimes the server get down and shows

Connection refused to host: 127.0.0.1; nested exception is: 
	java.net.ConnectException: Connection refused (Connection refused)

in the logs i found this error

java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused (Connection refused)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:623) ~[na:1.8.0_282]
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216) ~[na:1.8.0_282]
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202) ~[na:1.8.0_282]
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:343) ~[na:1.8.0_282]
at sun.rmi.registry.RegistryImpl_Stub.lookup(RegistryImpl_Stub.java:116) ~[na:1.8.0_282]
at org.transitclock.ipc.rmi.ClientFactory.getRmiStub(ClientFactory.java:169) ~[transitclockCore-2.0.0-SNAPSHOT.jar:na]
at org.transitclock.ipc.rmi.RmiCallInvocationHandler.invoke(RmiCallInvocationHandler.java:257) ~[transitclockCore-2.0.0-SNAPSHOT.jar:na]
at com.sun.proxy.$Proxy77.get(Unknown Source) ~[na:na]
at org.transitclock.api.rootResources.TransitimeApi.getPredictions(TransitimeApi.java:583) ~[classes/:na]
at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_282]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_282]
i don't know what happened can anyone help?