CREATE_FAILED: ApiGatewayMethodActionPost (AWS::ApiGateway::Method) - Invalid type for parameter selectionPattern

I'm trying to deploy my serverless app on local stack but Invalid type parameter for selectionPattern error is being thrown. Below is the complete error and serverless.yml

Error:

ApiGatewayMethodActionPost (Parameter validation failed:; Invalid type for parameter selectionPattern, value: 200, type: <class 'int'>, valid types: <class 'str'>)

serverless.yml

  events:
    - http:
        path: /action
        method: POST
        iamRole: arn:aws:iam::xxxxxxxxxxxx:role/someRole
        action: StartSyncExecution
        request:
          template:
            application/json: |
              {
                "stateMachineArn":"arn:aws:states:'us-west-2':xxxxxxxxxxxx:stateMachine:someMachine",
                "input": "$util.escapeJavaScript($input.json('$'))"
              }
        response:
            template: 
              application/json: |
                $input.path('$.output')

I was checking serverless-step-function code where selectionPattern is defined as integer and not string. Following is the link to the code: code

Inizia dalla configurazione serverless.yml nel report e confrontala con il codice collegato di serverless-step-functions lib/deploy/events/apiGateway/methods.js alla riga 199. Riproduci il deployment con LocalStack, traccia il modo in cui viene generato selectionPattern e conferma la correzione verificando che il metodo API Gateway venga distribuito senza l'errore di tipo del parametro.