Thanks for your swift reply,

But how to determine which component is adding the jos_jam_receivers table? Is there any way?

Sorry If I may sound dumb.

Actually, the Login module was working fine previously. Suddenly there was some problem (may be that has occured after I installed some other component or sth), and I have never changed the Login module parameters.

As you have told, I feel that there is some wrong selection of PMS, because I cant send messages to other profile members.

And the error message its showing is "Invalid Code Specified"

What is the Default PMS component for CB??
So that I will cross check

Where are the possible places to check that?

Thanks in Advance

Hi.......

You are really great........

In the login Module,

I have given the Private Messaging System --> "JAM"

But I havent installed any component named "JAM" as I thought that it comes inbuilt with Joomla.

Now, I have changed that
Private Messaging System --> "No System Installed".

Its working fine and there is no error. Also I have the captha plugin for the Registration page and its working fine.

Is there any default inbuilt PMS for Joomla or do I need to install those components as separate? If yes then please suggest some.......

Thanks a Ton for all your help and time.