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The form.errors is not a dictionary, at least according to other related questions in StackOverflow:
django: how to access only first error message in form.errors?
If you really need to get only first error (remembering that all field errors will come together), you can try to convert to values and then get the first item, like:
{{form.errors.values.0}}
or
{{form.errors.items.0}}
This second will return a tuple with label and error message.
Source:stackexchange.com