在测试使用ftp读写文件的时候报错!插件[ftpreader,ftpWriter]加载失败，1s后重试

有人遇到过这种情况吗? 别的测试都没有问题.就是在同步ftp文件时候出错
[root@master bin]# python datax.py ../job/testjob.json
DataX (DATAX-OPENSOURCE-3.0), From Alibaba !
Copyright (C) 2010-2017, Alibaba Group. All Rights Reserved.
2018-03-27 03:21:35.675 [main] WARN ConfigParser - 插件[ftpreader,ftpWriter]加载失败，1s后重试... Exception:Code:[Framework-12], Description:[DataX插件初始化错误, 该问题通常是由于DataX安装错误引起，请联系您的运维解决 .]. - 插件加载失败，未完成指定插件加载:[ftpWriter, ftpreader]
2018-03-27 03:21:36.704 [main] ERROR Engine -
经DataX智能分析,该任务最可能的错误原因是:
com.alibaba.datax.common.exception.DataXException: Code:[Framework-12], Description:[DataX插件初始化错误, 该问题通常是由于DataX安装错误引起，请联系您的运维解决 .]. - 插件加载失败，未完成指定插件加载:[ftpWriter, ftpreader]
at com.alibaba.datax.common.exception.DataXException.asDataXException(DataXException.java:26)
at com.alibaba.datax.core.util.ConfigParser.parsePluginConfig(ConfigParser.java:142)
at com.alibaba.datax.core.util.ConfigParser.parse(ConfigParser.java:63)
at com.alibaba.datax.core.Engine.entry(Engine.java:137)
at com.alibaba.datax.core.Engine.main(Engine.java:204)

Start by reproducing the command shown with ../job/testjob.json and read the stack trace entries in ConfigParser.java and Engine.java. Check how the ftpreader and ftpWriter plugins are initialized and why both fail to load. Done means the plugins load without Framework-12 and the FTP synchronization job proceeds.

Written by the indexing model from the issue text.