Falcon application can not render Openapi(swagger) specification
When calling APISpec, not all strings are supported.Try something like "0.0.1" (you supplied 'latest').Also, using falcon_swagger_ui, an error may be reported if the openapi_version format is not correct (in such case, examples of valid formats are provided).
This works for me:
spec = APISpec( title="My APP", version="0.0.1", openapi_version='3.0.0', plugins=[FalconPlugin(api)] )