Hello @williamouchi,
you have a typing (inversed) error in line 319, in constraint cell:
${menagepro} =! ${effectif_menage} must be
${menagepro} != ${effectif_menage}
If you correct it, it should work.
Hint: In this line you have the SAME condition in the relevant cell. So, your errorneous constraint might even to be deleted here?
Also, you have similar duplication (relevant cell = constraint cell) in other lines, e.g. 269, 279, 289, 299, 309.
“No JSON error” often results from such simple typing errors, like: > = instead of >= or '…" instead of ‘…’… Esp. in relevant, constraint or calculation cell.
Preview seems to work in such cases, (but your constraint would not fire). The error shows on deploy.
See also previous community discussion (and examples):
To localise those errors, you can delete step by step and try to deploy: e.g. whole column relevant, If deployment ok, then step by deleting/empty 100 sequencing. cells, etc.
Sometimes also https://getodk.org/xlsform/ might help. In your case it shows another problem, you should fix
Kind regards
