chirpy2291 commented on issue #3604: Mapbox Visualizatuion error cause by "is not JSON serializable" URL: https://github.com/apache/incubator-superset/issues/3604#issuecomment-362242822 Hi, i am facing the same issue.On running single custom dimension i get the following error: KeyError: u"None of [[u'outputName', u'extractionFn', u'type', u'outputType', u'dimension']] are in the [index]" Can you specify which version of druid to use? and what is the fix?
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