Errors using curl for nutch RESTapi calls

Question

I am using curl to make RESTapi calls to my nutch server running on a ubuntu instance. When I make the following call with curl to create my seeds file on my server

curl -X POST http://**.185.***.**:8081/seed/create -d {"id": "ubuntu", "name": "servertest1", "seedUrls": [{"id":1,"seedList":null,"url":"http://www.******.com/"}]}

I receive the following error

The given resource variant is not supported.Please use one of the following:

* Variant[mediaType=application/json, language=null, encoding=null]
curl: (6) Could not resolve host: ubuntu,
curl: (6) Could not resolve host: name
curl: (6) Could not resolve host: servertest1,
curl: (6) Could not resolve host: seedUrls
curl: (3) [globbing] bad range in column 2
curl: (3) [globbing] bad range in column 2
curl: (3) [globbing] bad range in column 2

Thanks for your help in advance, I'm new to HTTP calls so I'm very lost