Amazon data insertion

I am working with amazon services for insert images, video and audio data.

I found the following error:

Error Domain=com.amazonaws.AWSSTSErrorDomain Code=0 "The operation couldn’t be completed. (com.amazonaws.AWSSTSErrorDomain error 0.)" UserInfo=0x175673b0 {Type=Sender, Message=Not authorized to perform sts:AssumeRoleWithWebIdentity, __text=( "\n ", "\n ", "\n ", "\n " ), Code=AccessDenied}

Please tell me where is the problem.

Thanks

Yogesh Jindal