GraphQLError: Syntax Error: Expected "schema", found String "Represents a schema"

[krainboltgreene]

Intended outcome:

Extension works

Actual outcome:

GraphQLError: Syntax Error: Expected "schema", found String "Represents a schema"
    at syntaxError (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/node_modules/graphql/error/syntaxError.js:15:10)
    at Parser.expectKeyword (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/node_modules/graphql/language/parser.js:1435:42)
    at Parser.parseSchemaDefinition (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/node_modules/graphql/language/parser.js:738:10)
    at Parser.parseTypeSystemDefinition (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/node_modules/graphql/language/parser.js:690:23)
    at Parser.parseDefinition (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/node_modules/graphql/language/parser.js:154:19)
    at Parser.many (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/node_modules/graphql/language/parser.js:1518:26)
    at Parser.parseDocument (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/node_modules/graphql/language/parser.js:111:25)
    at Object.parse (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/node_modules/graphql/language/parser.js:36:17)
    at FileSchemaProvider.loadFileAndGetDocument (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/lib/language-server/providers/schema/file.js:57:30)
    at FileSchemaProvider.resolveSchema (/home/codespace/.vscode-remote/extensions/apollographql.vscode-apollo-1.19.6/lib/language-server/providers/schema/file.js:23:21) {
  locations: [ { line: 1, column: 1 } ]
}

How to reproduce the issue:

1. Use elixir absinthe to generate a schema document
2. Start vscode

Versions

Here's the schema:

"Represents a schema"
schema {
  query: RootQueryType
  mutation: RootMutationType
  subscription: RootSubscriptionType
}

As far as I know this should be valid.