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lang-js
dataprovided byyoutubeincludes anundefinedelement in the collection –[ { id: 442 }, undefined ]. If you add the conditionif dataunder theeach, does it succeed then?#{...}at the start of a line renders a dynamically-named element –<442></442>. I'm guessing that's probably not what you were going for. To renderdata.idas text, add an element or a pipe before it –div #{data.id}or| #{data.id}.