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Field must not have a selection since type "String" has no subfields.

See original GitHub issue

There was an error in your GraphQL query:

Field “headerImage” must not have a selection since type “String” has no subfields.

This can happen if you e.g. accidentally added { } to the field “headerImage”. If you didn’t expect “headerImage” to be of type “String” make sure that your input source and/or plugin is correct.

gatsby-config.js 👇🏻

plugins: [
    "gatsby-plugin-sharp",
    "gatsby-transformer-sharp",
    {
      resolve: "gatsby-transformer-remark",
      options: {
        plugins: [
          "gatsby-remark-relative-images",
          {
            resolve: "gatsby-remark-images",
            options: {
              maxWidth: 750,
              linkImagesToOriginal: false,
            },
          },
        ],
      },
    },
    "gatsby-plugin-react-helmet",
    {
      resolve: "gatsby-source-filesystem",
      options: {
        name: "images",
        path: `${__dirname}/src/images`,
      },
    },
    {
      resolve: "gatsby-source-filesystem",
      options: {
        name: "src",
        path: `${__dirname}/src/`,
      },
    },

.md 👇🏻

pluginName: Unsplash
pluginLogo: ../images/unsplash_logo.jpeg
headerImage: ../images/unsplash_header.jpeg
creatorName: Unsplash
creatorImage: ../images/unsplash_creator.png
pluginLink: https://www.figma.com/community/plugin/738454987945972471/Unsplash

query👇🏻

query($slug: String!) {
    markdownRemark(fields: { slug: { eq: $slug } }) {
      html
      frontmatter {
        pluginName
        headerImage {
          childImageSharp {
            fluid(maxWidth: 340) {
              ...GatsbyImageSharpFluid
            }
          }
        }
      }
    }
  }

P.S. did go through similar issues. did not help…