Graphql-js tutorial mutation './src/schema.graphql'

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Following the tutorial, a simple mutation, I am getting error at './src/schema.graphql'. I am using node version v11.1.0

/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/lexer.js:280 throw (0, _syntaxError.syntaxError)(source, pos, unexpectedCharacterMessage(code)); ^ GraphQLError: Syntax Error: Cannot parse the unexpected character "/". at syntaxError (/Users/raghu/Documents/hackernews-node/node_modules/graphql/error/syntaxError.js:15:10) at readToken (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/lexer.js:280:38) at Object.lookahead (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/lexer.js:55:43) at Object.advanceLexer [as advance] (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/lexer.js:45:33) at expectOptionalToken (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/parser.js:1440:11) at many (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/parser.js:1517:11) at parseFieldsDefinition (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/parser.js:852:54) at parseObjectTypeDefinition (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/parser.js:806:16) at parseTypeSystemDefinition (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/parser.js:704:16) at parseDefinition (/Users/raghu/Documents/hackernews-node/node_modules/graphql/language/parser.js:137:16)