dynamoid gem is not able to connect the aws dynamodb

i'm using sinatra application.. ruby version 2.2.2, gem 'aws-sdk-v1', gem 'dynamoid', now i want to use dynamoid gem to communicate with aws dynamodb.. when i use the AWS.config({access_key_id : "some_key",:secreat_key_id: "dsgdgdgd"}) i given my amazons access_key and scereat_key correctly... when i run the application to connect dynamodb through dynamoid gem it show error like this... AWS::DynamoDB::Errors::UnrecognizedClientException: The security token included in the request is invalid. please give me solution to connect dynamodb using dynamoid gem.