There has been a problem trying to replace ${B2...}

Unexpected KoBoCAT error 400: b’{“detail”:“There has been a problem trying to replace ${B2_WHICH_MEMBER_S_OF_THE_HOU} with the XPath to the survey element named 'B2_WHICH_MEMBER_S_OF_THE_HOU'. There is no survey element with this name.”}’

Welcome to the community, @99911111! Maybe this online validator should help you identify the exact problem. But this post discussed previously should also help you know what’s wrong with your syntax.

Note you generally see this error message when you reference a variable that is not (yet) defined in your form.

Thank you so much, and it is very useful

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