Inaccessible host error at ap-northeast-2 region while deploying

Serverless Framework
3

I added role and vpc to serverless.yml, but experiencing same error.

provider:
  name: aws
  runtime: nodejs6.10
  role: arn:aws:iam::888888273532:role/service-role/myRole
  vpc:
    securityGroupIds:
      - sg-88748888
    subnetIds:
      - subnet-88827888
      - subnet-88835888
  stage: dev
  region: ap-northeast-2
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