CDK WAF Python Multiple Statement values error

I have AWS WAF CDK that is working with rules, and now I'm trying to add a rule in WAF with multiple statements, but I'm getting this error:

Resource handler returned message: "Error reason: You have used none or multiple values for a field that requires exactly one value., field: STATEMENT, parameter: Statement (Service: Wafv2, Status Code: 400, Request ID: 6a36bfe2-543c-458a-9571-e929142f5df1, Extended Request ID: null)" (RequestToken: b751ae12-bb60-bb75-86c0-346926687ea4, HandlerErrorCode: InvalidRequest)

The block of rule in code:

                {
        'name': 'ruleName',
        'priority': 3,
        'statement': {
            'orStatement': {
                'statements': [
                    {
                        'iPSetReferenceStatement': {
                            'arn': 'arn:myARN'
                            }
                    },
                            {
                        'iPSetReferenceStatement': {
                            'arn': 'arn:myARN'
                            }
                    }
            ]
            }
            },
            'action': {
               'allow': {}
        },
          'visibilityConfig': {
              'sampledRequestsEnabled': True,
               'cloudWatchMetricsEnabled': True,
              'metricName': 'ruleName'
           }
          },