May I know how to set process variable to be boolean in process model, plus it always return to be null value and failed to write to database by using process model.
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there you see its just updating the variable submit and "aa". not the variable "username" , so the value stays NULL -> this means you try to save a null value which crashes your process.
I know, but why username doesn't receive any responding values since I already let ri!username.username,ri!username.password write in saveInto?
I delete the "aaa" value, but it is still not let the values process through, so I don't think that is the problem.