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." } ] }