UploadFile issue

Hi Guys,

I am getting this error when I try to upload one file to no my onedrive foder. 
Any idea what's going on ? 

"error": {
    "code": "BadRequest",
    "message": "Entity only allows writes with a JSON Content-Type header.",
    "innerError": {
      "request-id": "d4d67977-d052-435d-85c1-36c6e177105e",
      "date": "2017-06-28T21:09:02"