Serverless 1.28 enable CORS gives error An error occurred: ApiGatewayMethodPreviewOptions - Method already exists for this resource

The resource was previously deployed. I have now enabled CORS and tried deploying. Now it throws error as below.

Serverless Error ---------------------------------------

An error occurred: ApiGatewayMethodPreviewOptions - Method already exists for this resource (Service: AmazonApiGateway; Status Code: 409; Error Code: ConflictException; Request ID: 15402480-8b5b-11e8-bbee-378f583b9f67).

Get Support --------------------------------------------
Docs: docs.serverless.com
Bugs: github.com/serverless/serverless/issues
Issues: forum.serverless.com

Your Environment Information -----------------------------
OS: darwin
Node Version: 8.11.1
Serverless Version: 1.28.0

Here is the snippet of the yaml configuration.
events:
- http:
path: preview
method: get
cors: true

Was CORS enabled on the API Gateway manually? If so, try removing it manually and then deploying with Serverless.

Thanks, that helped. Removed OPTIONS method for api which was created when i manually enabling CORS.