AssertionError: relay-101/index.js: getBabelRelayPlugin(): Expected schema to be an object with a `__schema` - relay

Question

I was following Relay 101: Building A Hacker News Client Tutorial.
But in the process I got error
AssertionError: relay-101/index.js: getBabelRelayPlugin():
Expected schema to be an object with a `__schema` property.
at getSchema (/Users/ruseel/p/spike/relay-101/node_modules/babel-relay-plugin/src/getBabelRelayPlugin.js:224:3)
at NodePath.Plugin.visitor.TaggedTemplateExpression (/Users/ruseel/p/spike/relay-101/node_modules/babel-relay-plugin/src/getBabelRelayPlugin.js:104:26)
...
and after little digging (console.log in getBabelRelayPlugin.js) I noticed introspection var in getBabelRelayPlugin.js
const introspection = typeof schemaProvider === 'function' ?
schemaProvider() :
schemaProvider;
is like this.
{"errors":[{"message":"Must provide query string."}]}
But I have no idea why this is happening?
Why is this error happening?
any direction would be appreciated.

Answer 1

I made a typo in babelRelayPlugin.js, instrospectionQuery instead of introspectionQuery.
var babelRelayPlugin = require('babel-relay-plugin');
var introspectionQuery = require('graphql/utilities').introspectionQuery;
var request = require('sync-request');
var graphqlHubUrl = 'http://www.graphqlhub.com/graphql';
var response = request('GET', graphqlHubUrl, {
qs: {
query: introspectionQuery
}
});