cloud-custodian: Set VPC Flow log error - "state" attribute

I am trying to design a policy to enable VPC flow logs for all VPC that does not have it enabled. The policy is:

policies:
  - name: enable-vpc-flow-logs
    resource: vpc
    comments: |
      Enables VPC flow logs
    mode:
      execution-options:
        log_group: /aws/enable-vpc-flow-logs/resources
      role: arn:aws:iam::{account_id}:role/CloudCustodianExecutionRole
      type: periodic
      schedule: "rate(2 minutes)"
    filters:
      - type: flow-logs
        enabled: false
    actions:
      - type: set-flow-log
        DeliverLogsPermissionArn: arn:aws:iam::${ACCOUNT}:role/role
        LogGroupName: /custodian/vpc/flowlogs/
        TrafficType: ALL
        state: true

However i am getting the following error, not sure why even when i am passing the state information:

START RequestId: bd7b329c-d677-11e8-8925-01840da49e11 Version: $LATEST
[INFO]	2018-10-23T03:57:20.426Z	bd7b329c-d677-11e8-8925-01840da49e11	Processing event
{
    "account": "[sanitized]",
    "region": "us-east-1",
    "detail": {},
    "detail-type": "Scheduled Event",
    "source": "aws.events",
    "version": "0",
    "time": "2018-10-23T03:56:45Z",
    "debug": true,
    "id": "a83eb09d-de5e-2155-62ef-24490c335d43",
    "resources": [
        "arn:aws:events:us-east-1:8[sanitized]:rule/custodian-enable-vpc-flow-logs"
    ]
}

[DEBUG]	2018-10-23T03:57:20.427Z	bd7b329c-d677-11e8-8925-01840da49e11	Storing output with <CloudWatchLogOutput to group:/aws/enable-vpc-flow-logs/resources stream:enable-vpc-flow-logs>
[DEBUG]	2018-10-23T03:57:20.899Z	bd7b329c-d677-11e8-8925-01840da49e11	Running policy enable-vpc-flow-logs resource: vpc region:us-east-1 c7n:0.8.31.2
[DEBUG]	2018-10-23T03:57:21.312Z	bd7b329c-d677-11e8-8925-01840da49e11	Filtered from 1 to 1 vpc
[INFO]	2018-10-23T03:57:21.312Z	bd7b329c-d677-11e8-8925-01840da49e11	policy: enable-vpc-flow-logs resource:vpc region:us-east-1 count:1 time:0.25
[DEBUG]	2018-10-23T03:57:21.321Z	bd7b329c-d677-11e8-8925-01840da49e11	metric:ResourceCount Count:1 policy:enable-vpc-flow-logs restype:vpc scope:policy
[DEBUG]	2018-10-23T03:57:21.321Z	bd7b329c-d677-11e8-8925-01840da49e11	metric:PolicyException Count:1 policy:enable-vpc-flow-logs restype:vpc
[DEBUG]	2018-10-23T03:57:21.321Z	bd7b329c-d677-11e8-8925-01840da49e11	metric:ApiCalls Count:0 policy:enable-vpc-flow-logs restype:vpc
[ERROR]	2018-10-23T03:57:21.522Z	bd7b329c-d677-11e8-8925-01840da49e11	Error while executing policy
Traceback (most recent call last):
File "/var/task/c7n/policy.py", line 273, in run
results = a.process(resources)
File "/var/task/c7n/resources/vpc.py", line 1810, in process
if not self.state:
AttributeError: 'CreateFlowLogs' object has no attribute 'state'
'CreateFlowLogs' object has no attribute 'state': AttributeError
Traceback (most recent call last):
File "/var/task/custodian_policy.py", line 4, in run
return handler.dispatch_event(event, context)
File "/var/task/c7n/handler.py", line 91, in dispatch_event
p.push(event, context)
File "/var/task/c7n/policy.py", line 834, in push
return mode.run(event, lambda_ctx)
File "/var/task/c7n/policy.py", line 516, in run
return PullMode.run(self)
File "/var/task/c7n/policy.py", line 273, in run
results = a.process(resources)
File "/var/task/c7n/resources/vpc.py", line 1810, in process
if not self.state:
AttributeError: 'CreateFlowLogs' object has no attribute 'state'

END RequestId: bd7b329c-d677-11e8-8925-01840da49e11