@sara.alyahya You likely have a selectOptionByValue or selectOptionByLabel on an element that is NOT a select. You may have it named select…, but when you look at the tag inside the TestObject, you have it as an input.
(An input is a textbox, radio button or checkbox; a select is a drop-down list.)
Double click on the element within the Object Repository and look at the element’s list of attributes–especially the tag attribute. You should now look at the page’s source code and Inspect the element to get more information. If you show some of your HTML we should be able to give you more assistance.