graphql-tools: Unknown type

I have a problem creating pagination. When creating types, it appears to me that the type is Unknown

schema:

# import Post from "../types/Post.graphql"
# import PageInfo from "../types/PageInfo.graphql"

type Edge {
	cursor: String!
	node: Post!
}

type PostsCursor {
	edges: [Edge!]!
	pageInfo: PageInfo!
	totalCount: Int!
}

type Query {
	posts(filter: String, first: Int, after: String): PostsCursor!
}

logs:

Error: Unknown type "Edge".

Unknown type "PageInfo".
at assertValidSDL (/Users/youhosi/Dev/site/node_modules/graphql/validation/validate.js:107:11)
at Object.buildASTSchema (/Users/youhosi/Dev/site/node_modules/graphql/utilities/buildASTSchema.js:45:34)
at makeSchema (/Users/youhosi/Dev/site/node_modules/@graphql-tools/merge/index.cjs.js:917:99)
at Object.mergeSchemas (/Users/youhosi/Dev/site/node_modules/@graphql-tools/merge/index.cjs.js:900:12)
at loadSchemaSync (/Users/youhosi/Dev/site/node_modules/@graphql-tools/load/index.cjs.js:623:26)
at Object.<anonymous> (/Users/youhosi/Dev/site/server/graphql/index.js:7:16)
at Module._compile (internal/modules/cjs/loader.js:1200:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1220:10)
at Module.load (internal/modules/cjs/loader.js:1049:32)
at Function.Module._load (internal/modules/cjs/loader.js:937:14)
at Module.require (internal/modules/cjs/loader.js:1089:19)
at require (internal/modules/cjs/helpers.js:73:18)
at Object.<anonymous> (/Users/youhosi/Dev/site/server/server.js:15:16)
at Module._compile (internal/modules/cjs/loader.js:1200:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1220:10)
at Module.load (internal/modules/cjs/loader.js:1049:32)