在metalink 文档Cannot Configure Grid Targets [ID 840367.1] 中得到这样解释：
Cause
The OMS 10.2.0.2 is too old and its not able to parse the response of the 10.2.0.5 agent
Solution
Upgrade the OMS to 10.2.0.4 or 10.2.0.5
这个环境中agent 端确实是10.2.0.5 ，而oms 端是10.2.0.2 。只能升级OMS 了。