nodejs remove listener event

//event.js file
var events = require('events');
var emitter = new events.EventEmitter();
//define two functions
var printsome1= function(arg1, arg2){
console.log('listener1', arg1, arg2);
}
var printsome2= function(arg1, arg2){
console.log('listener2', arg1, arg2);
}
emitter.on('someEvent', printsome1);
emitter.on('someEvent', printsome2 );
//Remove printsome1 in event someEvent (removed must be registered event)
emitter.removeListener('someEvent',printsome1);
emitter.emit('someEvent', 'arg1 parameter', 'arg2 parameter ');