Hey Jeenesh, this is one of the most common problems of Accessibility Mode. This happens because of the structure of the application screen you are interfacing makes it impossible for the spy tool to highlight the element. You can try using Application Navigator of Application Modeller which provides a treeview of all the Accessibility Elements available within the application so that they can be easily found and selected.
To open Application Navigator, click the Open Application Navigator option with the button menu. Once the application model treeview has been generated, you can click on different elements within the Application Model Treeview the element will highlight in the application. Once the element you want is found and selected in the treeview you can press the OK button to use the element in Application Modeller.