Amazon dynamodb 未在serverless.yml文件中创建DynamoDB表

运行sls offline start并尝试访问用户终结点后，获取错误无法对不存在的表执行操作。serverless.yml文件如下所示：

service: 
  name: digital-secret

plugins:
  - serverless-dynamodb-local
  - serverless-offline # must be last in the list

custom:
  userTableName: 'users-table-${self:provider.stage}'
  dynamoDb:
    start:
      migrate: true

provider:
  name: aws
  runtime: nodejs8.10
  stage: dev
  region: us-east-2
  iamRoleStatements:
    - Effect: Allow
      Action:
        - 'dynamodb:Query'
        - 'dynamodb:Scan'
        - 'dynamodb:GetItem'
        - 'dynamodb:PutItem'
        - 'dynamodb:UpdateItem'
        - 'dynamodb:DeleteItem'
      Resource:
        - { "Fn::GetAtt": ["usersTable", "Arn"] }
  environment:
    USERS_TABLE: ${self:custom.userTableName}

functions:
  app:
    handler: index.handler
    events:
      - http: ANY /
      - http: 'ANY {proxy+}'
  user:
    handler: index.handler
    events:
      - http: 'GET /users/{proxy+}'
      - http: 'POST /users'

resources:
  Resources:
    usersTable:
      Type: 'AWS::DynamoDB::Table'
      Properties:
        TableName: ${self:custom.userTableName}
        AttributeDefinitions:
          - AttributeName: userId
            AttributeType: S
        KeySchema:
          - AttributeName: userId
            KeyType: HASH
        ProvisionedThroughput:
          ReadCapacityUnits: 1
          WriteCapacityUnits: 1

有人能帮我指出这里出了什么问题吗？我已经浏览了这些文档，并查看了许多不同的在线示例，但我所看到的与上面的没有什么不同。

文档说自定义块的结构应如下所示：

custom:
  dynamodb:
    start:
      migrate: true

---

您使用的是dynamoDb而不是dynamoDb

如果其他人对此有问题，我花了数小时试图跟踪此问题，这是因为我无意中在serverless.yml中的[r]esources部分遇到了错误的情况

Resources:    <-- Needs to be lower case 'r'
  Resources:
    usersTable:
      Type: 'AWS::DynamoDB::Table'
      Properties:
  ...