What does this instagram api error mean?

Question

API

https://api.instagram.com/v1/users/userid/relation...
action=follow
When sending a request to subscribe for some tokens, such a response, what can it mean?
Response and actual error:
{"meta":{"error_type":"OAuthClientException","code":400,"error_message":"The client used for authentication is no longer active."}}

Answer 1

did he work at all?