adwords error

EstimateKeywordTraffic.php example I have developerToken, client_id, client_secret and refresh_token. Responce: An error has occurred: { "error" : "invalid_grant" } What are the possible causes? -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog and Google+: https:/

Error: invalid_client

*GetRefreshToken.php* *responce browser:* *401.* That’s an error. *Error: invalid_client* no support email -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog and Google+: https://googleadsdeveloper.blogspot.com/ https://plus.google.co