Rails - May 2014 - OAuth2 client credentials grant error UnsupportedAuthorizationScheme

Dear ALL,
 Anyone have come accross the following error, your comments
would be of great help, plz suggest on this,OAuth2::Error
({"ErrorCode":"
UnsupportedAuthorizationScheme","ErrorMessage":"Only
'Bearer' scheme is supported for Authorization header."})*

Any help is greatlly appreciated
Thanks & Regards,
Usha

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