Google tasks position error

I am trying to use the google tasks api in a chrome extension, but when I try too make a task with ?previous set I get this:

"{
 "error": {
  "errors": [
    {
    "domain": "global",
    "reason": "invalid",
    "message": "Invalid Credentials",
    "locationType": "header",
    "location": "Authorization"
   }
  ],
  "code": 401,
  "message": "Invalid Credentials"
 }
}
"

This is the ur开发者_运维百科l I am using: 'https://www.googleapis.com/tasks/v1/lists/@default/tasks?previous='+lastid. I use javascript as my main language. I am willing to give code samples but only if necessary.

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Try using oauth.sendSignedRequest like in the official google tasks api chrome extension, you should be able to add the previous argument in req['parameters'].