Welcome to our community. Thank you for letting us know your issue.
Can you please help follow this release note: Katalon Studio Release Notes: Version 10.x | Katalon Docs to update the compatible Appium version? Otherwise, if it does not work, please share the error log / screenshot for better support?
If this is for KS, you need to read the release notes. In the release notes, it states you have to change “MobileElement” to WebElement as @le.duc.anh stated.