处理错误：找到接口org.apache.hadoop.mapreduce.TaskAttemptContext，但是类是预期的

I am using CDH4 and have written a MapReduce application using the new mapreduce API. I have compiled it against hadoop-core-1.0.3.jar and when I run it on my Hadoop cluster I get the error:I am using CDH4 and have written a MapReduce ap