Hi Saurabh2903,
Usually when this happens it is recommended to have a Wait stage just before accessing the element.
It is preferred to have a Dynamic Wait stage which checks that the element exists before attempting to access it.
Check if the above works.
If you are getting the "Multiple elements match" error or "Unable to find element" error, then you have to tweak and play around with the Application Modeller while spying that element to find an accurate match. The lesser the attributes in the 'Match' column, the better it is. But you need to identify the right set of attributes that correctly match that element.