"No FileSystem for scheme: hdfs" when submitting a remote job

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Hi,

I am trying to submit a remote mapreduce job in Yarn with the 
configuration below, but I get the error |No FileSystem for scheme: 
hdfs|. The error is so also below. Why this is happening?

|          String host = "192.168.56.100";

           Configuration conf = job.getConfiguration();
           // this should be like defined in your yarn-site.xml
           conf.set("yarn.resourcemanager.address", host + ":50001");

            // framework is now "yarn", should be defined like this in 
mapred-site.xm
            conf.set("mapreduce.framework.name", "yarn");

            // like defined in hdfs-site.xml
            conf.set("fs.defaultFS", "hdfs://" + host + ":9000");

            for (Path inputPath : inputPaths)
                FileInputFormat.addInputPath(job, new Path(conf.get("fs.defaultFS") + 
"/" + inputPath.toString()));

            FileOutputFormat.setOutputPath(job, new Path(conf.get("fs.defaultFS") + 
"/" + tempPath));

            job.waitForCompletion(true);
|

|Exception in thread "main" java.io.IOException: No FileSystem for scheme: hdfs
    at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2584)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2591)
    at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:91)
    at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2630)
    at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2612)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:370)
    at org.apache.hadoop.fs.Path.getFileSystem(Path.java:296)
    at 
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.addInputPath(FileInputFormat.java:518)
    at 
org.apache.hadoop.mapred.examples.JobExecution.submit(JobExecution.java:169)
    at org.apache.hadoop.mapred.examples.WordCount.main(WordCount.java:101)
|

Thanks,

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