Hi Ali,
The simple answer to your duplicate question is that the element was not identified uniquely. Some elements can even change from one run to the other due to environmental issues or how the UI was populated for each different case.
If you got element that keep up being not unique, then sometimes you can successfully use the Match Index, that can be set to 1, 2, ... depending if you want to use the firs occurrence, the second, or a later.
If this is still unclear, then please share the spy-image (mask GDPR data) and the matching criteria you have chosen.
Happy coding!
---------------
Paul
Sweden
Happy coding!
Paul, Sweden
(By all means, do not mark this as the best answer!)