Can't deploy Aurora cluster with existence VPC

[m-yousri]

This was my configurations in the serverless.yml file, I'm using serverless framework to deploy:

aurora:
    username:
      !Join [
        '',
        [
          '{{resolve:secretsmanager:',
          !Ref AuroraDBUserSecret,
          ':SecretString:username}}'
        ]
      ]
    password:
      !Join [
        '',
        [
          '{{resolve:secretsmanager:',
          !Ref AuroraDBUserSecret,
          ':SecretString:password}}'
        ]
      ]
    identifier: 'aurora-serverless-cluster-${self:provider.stage}'
    backupRetentionPeriod: 10 # keep backups for 10 days
    backupWindow: 03:00-04:00 # utc
    maintenanceWindow: mon:05:00-mon:06:00 # utc
    minCapacity: 4
    maxCapacity: 16
    autoPause: true
    autoPauseSeconds: 60 # 1 minute
    vpc:
      name: VPC
      subnetName:
        - PrivateSubnet1
        - PrivateSubnet2

when I was deploying I faced this error:

 TypeError: Cannot read property 'map' of undefined
      at VPC.getCommonVPCResources