java.net.MalformedURLException: Local host name un

Question

I need to configure SymmtricDS in Linux redhat Machine as Master.I am referring URL to configure in linux I installed symmtricDS but when i start the service, using the below command

[root@samrtcity bin]# sudo sh sym_service start

it will show error like this

Waiting for server to start
..
java -Djava.io.tmpdir=/opt/SymmtricDS/symmetric-server-3.7.28/symmetric-server-3.7.28/tmp -jar /opt/SymmtricDS/symmetric-server-3.7.28/symmetric-server-3.7.28/lib/symmetric-wrapper.jar exec /opt/SymmtricDS/symmetric-server-3.7.28/symmetric-server-3.7.28/conf/sym_service.conf
    Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: samrtcity.in: samrtcity.in: unknown error
    java.lang.IllegalThreadStateException: process hasn't exited
            at java.lang.UNIXProcess.exitValue(UNIXProcess.java:424)
            at org.jumpmind.symmetric.wrapper.WrapperService.execJava(WrapperService.java:201)
            at org.jumpmind.symmetric.wrapper.WrapperHelper.run(WrapperHelper.java:32)
            at org.jumpmind.symmetric.wrapper.Wrapper.main(Wrapper.java:48)
    Error 8: Failed second stage
    Native error 8

Where did I go wrong?