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You might only have the above error in the browsable API, because the default djanog-rest-framework html template renderer does not work with the GeoJson format.
To test if that is the case, try to call your api endpoint requesting it in json format, i.e. /api/newpark.json
or equivalently /api/newpark?format=json
. This should show you geojson data, if it does your backend API is fine, and the problem is the browsable html form.
If you want a browsable API for your GeoJson endpoint, then you might need to change the html template used to render your API end point.
Source:stackexchange.com