Hi @Kal_Lam , I am experiencing the same error message, but my case is due to recent deployment of fresh KoboToolBox on our servers, I imported the form from kobotoolbox.org to our new deployment, our field officers have already filled thousands of forms downloaded from our kobotoolbox project and we…

@sulemn , well got it. If this is the case you will not be able to send it in your self hosted server. You are only able to send it to the HHI server from where you got it.