I've not seen that myself. Which version of Kibana 4 are you using... 4.1? 4.4? What exact steps do you take when this error appears? Could you attach a screenshot?
I'm not sure there is a REST endpoint within the Kibana server itself for dashboard creation. However, it should be possible to add this object to the .kibana index by writing directly to Elasticsearch.
Now i use directly this curl api to input in ElasticSearch (9200 and not Kibana=>5601) , much easier and usual.
But it's right that this method is better too.
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