Console warnings / bugs?

[hchood]

I'm seeing the following warnings in my console:

WARNING: Encountered "access_token" in payload, but no model was found for model name 
"accessToken" (resolved model name using masterminder@serializer:-active-
model:.typeForRoot("access_token"))

WARNING: Encountered "user_id" in payload, but no model was found for model name "userId" (resolved 
model name using masterminder@serializer:-active-model:.typeForRoot("user_id"))

WARNING: Encountered "token_type" in payload, but no model was found for model name "tokenType" 
(resolved model name using masterminder@serializer:-active-model:.typeForRoot("token_type"))

Sounds like I'm constructing some API response incorrectly.