There are three possible reasons for this error.
First, the locators may not match. See “Configure locators” in the failed step and verify that the locators are correct. Usetrace locators are css, id, name, xpath, and link_text. See the W3School documentation for CSS and XPath to learn how to write these locators manually.
Second, the locators may match too many elements. Hence, Usetrace does not know which element to click. Write more specific locators for your step.
Third, the locators may match, but the clicking fails. This may happen, for instance, because the element is covered by another element or the element is not visible.