When using UiPath Community Edition 2024 to loop through an Excel sheet, open Google Chrome, perform input actions, kill the process, and then reopen the browser to repeat the operation, it sometimes works correctly but other times throws an “element not found” error. Could this issue be caused by the browser object instance not being properly detected?
Dear @haixin.h.xu,
The element not found error occure as web page fully not loaded before performing input operation.
The solution is to use Fully Visible in taget of activity. This will perfrom operation when web page is fully loaded.
Additionally also set the input mode to Chromium API if you are using Chrome.
Mark as solution, if this helps you. 
Br,
NikZ
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It is due to selectors of the webpage you are performing automation. Configure your selector perfectly.
If you need further help then do share your actual problem and if possible share your webpage on which you are doing UiAutomation
Happy Automation.
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thinkyou,i will try.
thks bro ~~~~~~~~~~~