There has been a problem trying to replace ${Champ_ouvert} with the XPath to the survey element named 'Champ_ouvert'. There is no survey element with this name

[Kal_Lam]

@aminata, would you mind checking out row 877 from the survey tab? It has a constraint, ${Parc_agroforestier} != ${Champ_ouvert} where the name Champ_ouvert is not available anywhere else.

Fix this and it should solve your issue.