路径找不到Input path does not exist: hdfs://localhost:9000/user/root/WordCountMapReduce

Question

hadoop jar /home/wangjx27/demo.jar WordCountMapReduce /wordcount/input /wordcount/output

Exception in thread "main" org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: hdfs://localhost:9000/user/root/WordCountMapReduce

但是明明存在的啊