Not able to consume Web Services that are in Service Registry

Hi Experts,

I am trying to consume the web services that are published into the Service Registry of CE 7.1 Server.

Previously, I was able to consume the web services.But now I found the following error in VC Console, When i try to consume the same web services or even other web services that are there in that server.

"(E) Error in Search: Unknown error has occured in service execution"

Please help me to solve this issue.

Thanks,

Regards,

Palani