Uipath activities are not working in another machine

Hello Forum Members,
I am also facing the same issue. The flow is working fine in a system and then when we copy the project into another system and run it, it is failing with “element not found error”. I did reselect in new system and verified the properties and no change in the properties. Could someone help to resolve this issue. Thanks in advance.

Also, when I try to validate the selector in new system, validation is getting failed.