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Hi,
It seems to me that Canvas is complaining because some fields in your rows are not strings (i.e. not '123') but probably numbers (123).
Can you check that and sanitize the data if needed ?
Best,
Didier
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There are only three columns : time_stamps, item_id which is strings, and demand which is number. All the data has been check and there are no numbers in the item_id field.