Gatsby develop and Gatsby info both returning errors

Question

I don't quite know what happened to my build, Currently gatsby develop is returning TypeError: Cannot read property 'allMarkdownRemark' of undefined pointing to this file

gatsby-node.js:19 graphql.then.results
C:/Users/Anders/sites/gatsby-netlify-cms/gatsby-node.js:19:20

and gatsby info is returning after it returns info about the project error The system cannot find the path specified.

Here is the gatsby-node.js file

const path = require('path')

exports.createPages = ({ graphql, actions }) => {
  const { createPage } = actions
  return new Promise((resolve, reject) => {
    graphql(`
      {
        allMarkdownRemark {
          edges {
            node {
              frontmatter {
                slug
              }
            }
          }
        }
      }
    `).then(results => {
      results.data.allMarkdownRemark.edges.forEach(({ node }) => {
        createPage({
          path: `/posts${node.frontmatter.slug}`,
          component: path.resolve('./src/components/postLayout.js'),
          context: {
            slug: node.frontmatter.slug,
          },
        })
      })
      resolve()
    })
  })
}

I don't quite understand what is going on, I rolled back to changes that were working fine a minute ago, and now getting this weird error. I have tried upgrading node, I have tried reinstalling the gatsby cli. I am stuck. Thanks in advance.

Also including my package.json in case there is incompatibilities

{
  "name": "gatsby-starter-default",
  "description": "Gatsby default starter",
  "version": "1.0.0",
  "author": "Kyle Mathews <mathews.kyle@gmail.com>",
  "dependencies": {
    "babel-plugin-styled-components": "^1.9.2",
    "gatsby": "^2.0.53",
    "gatsby-image": "^2.0.22",
    "gatsby-plugin-manifest": "^2.0.9",
    "gatsby-plugin-netlify": "^2.0.6",
    "gatsby-plugin-netlify-cms": "^3.0.9",
    "gatsby-plugin-offline": "^2.0.16",
    "gatsby-plugin-react-helmet": "^3.0.2",
    "gatsby-plugin-sharp": "^2.0.15",
    "gatsby-plugin-sitemap": "^2.0.3",
    "gatsby-plugin-styled-components": "^3.0.4",
    "gatsby-source-filesystem": "^2.0.10",
    "gatsby-transformer-remark": "^2.1.15",
    "gatsby-transformer-sharp": "^2.1.9",
    "netlify-cms": "^2.3.0",
    "react": "^16.6.3",
    "react-dom": "^16.6.3",
    "react-helmet": "^5.2.0",
    "react-spring": "^6.1.10",
    "styled-components": "^4.1.2"
  },
  "keywords": [
    "gatsby"
  ],
  "license": "MIT",
  "scripts": {
    "build": "gatsby build",
    "develop": "gatsby develop",
    "start": "npm run develop",
    "format": "prettier --write \"src/**/*.js\"",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "devDependencies": {
    "prettier": "^1.15.2"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/gatsbyjs/gatsby-starter-default"
  }
}

Gatsby -v returns 2.4.7 and I am running node v10.14.2

Here is my gatsby-config file

module.exports = {
  siteMetadata: {
    title: 'Project Name',
    content: 'your name is weird',
    siteUrl: 'https://zealous-wright-0d00e0.netlify.com',
  },
  plugins: [
    'gatsby-plugin-react-helmet',
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `images`,
        path: `${__dirname}/src/images`,
      },
    },
    'gatsby-plugin-sitemap',
    'gatsby-transformer-sharp',
    'gatsby-plugin-styled-components',
    'gatsby-plugin-sharp',
    {
      resolve: `gatsby-plugin-manifest`,
      options: {
        name: 'project-name',
        short_name: 'project-name',
        start_url: '/',
        background_color: '#663399',
        theme_color: '#663399',
        display: 'minimal-ui',
        icon: 'src/images/logo.png', // This path is relative to the root of the site.
      },
    },
    // this (optional) plugin enables Progressive Web App + Offline functionality
    // To learn more, visit: https://gatsby.app/offline
    'gatsby-plugin-offline',
    {
      resolve: 'gatsby-source-filesystem',
      options: {
        path: `${__dirname}/src/team`,
        name: 'team',
      },
    },
    {
      resolve: 'gatsby-source-filesystem',
      options: {
        path: `${__dirname}/src/images`,
        name: 'images',
      },
    },
    'gatsby-transformer-remark',
    'gatsby-plugin-netlify-cms',
  ],
}

and I have a file in the gatsby-source-filesystem at src/team/riels-first-post.md

Answer 1

I had a very stupid bug, inside my markdown file there was no slug attribute which was being referenced across my code. This is what it should of looked like

---
title: Riel's First post
bio: I am a monkey with a dog
slug: "test"
---
Testing

Answer 2

You haven't posted your gatsby-config file but, judging by the error, I would say that your node file failed to find any markdown files which results in an undefined results.data .

In your gatsby config file there should be a directive similar to this one:

{
    resolve: `gatsby-source-filesystem`,
    options: {
        name: `posts`,
        path: `${__dirname}/static/content/collections/posts`,
    },
}

The above code instructs gatsby to look for markdown files in the specified path so make sure you have this directive inside your config and that the path contains at least one valid markdown file.