Hi Abhishek,
We had the same error on a OracleLogReaderAdapter after we had recreated the remote source. Basically, I dropped the agent and re-added it.
If you have done this (or you need to do this), you will need to complete the following steps:
Unregister the agent. This will cause a cascade delete of the remote source and all virtual tables created.
Stop the Agent service.
In the <agent install folder> (dataprovagent), under the LogReader directory, delete the complete directory relating to the remote source attached to the agent. For example, if the remote source was attached to an instance name 'abcd' so I deleted the whole directory named 'abcd'.
In the same LogReader directory, in the scripts directory is a *_logreader_script pertaining to your database type.
Then go through the steps to create the register the agent, register the adapter and create the remote source again.
I know it sounds painful, but it was the only way we could get it to work again.
It may pay to try the same thing for other CDC adapter types.
Hope this helps.
Jamie