How do I solve the given error

What have you tried so far?

You need to double-check all your bindings - especially the security settings.

Try turning off all security on your WS-HTTP binding - if it works, then there is a security or permissions issue.

Try using a default WS-HTTP binding - if it works, then you have misconfigured something.

Also try this:

http://briannoyes.net/2009/07/23/ObscureWCFExceptionNdashMislaidBlame.aspx

If all else fails, turn on WCF Tracing:

http://msdn.microsoft.com/en-us/library/ms733025.aspx

or this: http://msdn.microsoft.com/en-us/library/ms732009.aspx

And then use Service Trace Viewer to find out the exact error message: http://msdn.microsoft.com/en-us/library/ms732023.aspx