subscription field must return async iterable received 3a undefined

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1type Subscription {
2  post: PostSubscription
3}
4
5type PostSubscription {
6  postAdded: Post
7}
8

1Subscription: {
2  post: () => ({
3    PostSubscription: {}
4  })
5},
6PostSubscription: {
7  postAdded: {
8    subscribe: () => pubSub.asyncIterator(['postAdded'])
9  }
10}
11

1type Subscription {
2  postAdded: Post
3}
4

1"apollo-server-express": "1.3.6",
2"apollo-server-module-graphiql": "1.3.4",
3"graphql-subscriptions": "0.5.8",
4"graphql": "0.13.2",
5

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22message 22 3a 22subscription field must return async iterable received 3a undefined 22 subscription field must return async iterable received 3a undefined subscription field must return async iterable received 3a undefined