Uploading files using RestAPI "Unsupported Media Type"

I try the example mentioned here https://community.aras.com/b/english/posts/uploading-files-via-the-aras-innovator-rest-api.

However i get below error in Postman when i try to request token. I did add the values as "Formdata". We are using Aras 11 SP15. Any inputs will be helpful

{
    "ErrorMessage""Unsupported Media Type"
}
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