我正在尝试使用包含以下命令的shell脚本在oozie工作流中运行shell操作:.#!/bin/bashhadoopfs-mkdir/user/mathon_k/shell_dir.#echo"hello"我收到以下错误:Mainclass[org.apache.oozie.action.hadoop.ShellMain],exitcode[1]日志2014-03-2815:11:31,951INFOorg.apache.oozie.command.wf.ActionStartXCommand:USER[mathon_k]GROUP[-]TOKEN[]APP[oo_20140328]