With little information to go by, I would guess that one of your projection vectors (Placement Outline or Top Outline) are either not defined or invalid. Are you trying to fill the gap between the two parts with the pad?
I often used the 'General Pocket' features which is the 'inverse' of the 'General Pad' feature.
They are very old features, they are applied to a single solid body.
This features (general pad and pocket) are based on 'Through Curves' feature.
You can see it in the attached file.
Thanks for this information, but still i m in confusion , i want design connecting rod. Using this general pad option. it is possible to create by this same. Other wise please show how to design connecting rod. Make as soon as possible .