cant go on multiplayer

i try too create my own server but when i try too go in it says host unknown

19:07:23.698
Couldn't connect to server
java.net.UnknownHostException: jedhgoiergpoierjgiojre
at java.net.InetAddress.getAllByName0(InetAddress.java:1280)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at java.net.InetAddress.getByName(InetAddress.java:1076)
at dfd$1.run(SourceFile:65)