[INS-08106] Unexpected error occurred while loading the view 'GridPlugPlayInfoUI'

安装RAC GI，将要设置GridPlugPlay信息时，抛出如下错误

SEVERE: [FATAL] [INS-08106] Unexpected error occurred while loading the view 'GridPlugPlayInfoUI' associated to state 'GridPlugPlayInfoUI'.
  CAUSE: No additional information available.
  ACTION: Contact Oracle Support Services or refer to the software manual.
  SUMMARY:
      - java.lang.NullPointerException.
Refer associated stacktrace
#oracle.install.commons.util.exception.DefaultErrorAdvisor:458
INFO: Advice is ABORT
SEVERE: Unconditional Exit

这步设置GridPlugPlay信息时，需读取/etc/hosts文件内定义的网络接口信息。

ps:碰到过SUSE版本的系统，grid用户无权读取这个文件而导致无法执行安装。
仔细查看hosts文件内容，发现自己把ip地址写错了，随后两个节点都更正再次运行正常了。
另外hosts文件内有无效字符也会出现这个问题。