I am using the a! start process function on the button. so the error of process model in the rich text field.
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Hi Salonik, As far as I know, that's not possible. However, the a!startProecss smart service includes an onError parameter, which you can use to save a custom(eg: couldn't complete the action) error message. This message can be displayed in the user interface to inform users if started process encountered any error.
You could store the error to a process variable, and then display this to the user.