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

[tuscanlabs]

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)