Hi @Todd_Zheng
Welcome to our UiPath Forum!
I think there was a recent thread about this very issue, see here:
This simple, empty project will generate an input argument when published in Orchestrator:
Also, for the error
Error detecting project version.
It is due to the Robot machine not being updated to the latest version. Please make sure all your machines are on the latest 2019.7 version of Studio CE
See here for a guide on how to reinstall it: