@shahida.zahid This error is caused when you are trying to use either selectOptionByLabel or selectOptionByValue on an element that is NOT a select. If you can review the attributes of the element you will see that the tag attribute is NOT a select. Look at the page’s code for this element and check if it is a select or perhaps a search input.
And NO, you cannot just change the tag to be select because then the TestObject will not be found if it is not actually one.