problem with engines.json

hi everyone,
(i searched and it seems to me that this question is new)
i modified the engines.json adding the isidore engine with the script given by m.pouyllau (https://gitlab.huma-num.fr/pouyllau/ISIDORtero).
everything is going well, the lookup engines list appears with isidore inside it.
but.
after adding to engines.json any of the engines listed in http://egh.github.io/zotero-lookup-engines/ (say. e.g. the LOC engine), when i click the lookup button, no engines do appear. like the engines.json file results faulty.
any idea from scratch, before i post the quite long source code of my not working engines.json?
thank you for you help!
maurizio
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