Getting GLP-021 Error

I am trying to test my app in Sandbox. I have tried multiple accounts.

{

  "errors": [

    {

      "errorCode": "GLP-021",

      "message": "This API requires the requester to have a Glip profile. You might sign in to the application to create it."

    }

  ]

}

I have an account so I dont know why its doing this?

{ "errors": [ { "errorCode": "GLP-021", "message": "This API requires the requester to have a Glip profile. You might sign in to the application to create it." } ] }

{ "errors": [ { "errorCode": "GLP-021", "message": "This API requires the requester to have a Glip profile. You might sign in to the application to create it." } ] }