Forum Discussion

tonante27's avatar
tonante27
New Member
2 years ago

Issue Creating AWS API Gateway with API definitions due to a UnMarshall Exception Return Code 400

When I configure the following new Swagger Hub Api integration I get the following error message:       Create IntegrationUnable to unmarshall exception response with the unmarshallers provided ...
tonante727's avatar
tonante727
Occasional Contributor
2 years ago

The issue is probably resides in the Swagger Hub User Role. If you create an Integration for AWS API Gateway with Lambda Sync:,

  1. Do not add any info for the Role step.
  2. Verify that the gateway adds all your paths from the OpenAPI3 Swagger YAML definition
  3. Create you Lambda separately since the ones auto-generated are mockups anyway.
  4. The take a look at the permissions on your SwaggerHug user and see which ones will allow Lambda generation if that's prefered.
  5.