Serverless function in Gatsby site throwing error and not returning data locally

[jarren15]

Preliminary Checks

• This issue is not a duplicate. Before opening a new issue, please search existing issues: https://github.com/gatsbyjs/gatsby/issues
• This issue is not a question, feature request, RFC, or anything other than a bug report directly related to Gatsby. Please post those things in GitHub Discussions: https://github.com/gatsbyjs/gatsby/discussions

Description

I've created a serverless function in my Gatsby site as shown in the documentation, but it's throwing an error and not returning the data when accessed locally.

Reproduction Link

https://github.com/jarren15/dm_frontend

Steps to Reproduce

1. Navigate to the serverless function endpoint in the local development environment.
2. Attempt to fetch data using the serverless function.
3. Note the error encountered or observe that the fetched data is not returned as expected.
   ...

Expected Result

When accessing the serverless function locally, it should successfully fetch the data and return it without any errors.

Actual Result

The serverless function is throwing an error and failing to return the fetched data when accessed locally.

Environment

System:
    OS: Windows 11 10.0.22631
    CPU: (8) x64 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz
  Binaries:
    Node: 20.9.0 - C:\Program Files\nodejs\node.EXE
    npm: 10.2.1 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Chromium (122.0.2365.92)
  npmPackages:
    gatsby: ^5.13.3 => 5.13.3 
    gatsby-plugin-anchor-links: ^1.2.1 => 1.2.1 
    gatsby-plugin-image: ^3.13.1 => 3.13.1 
    gatsby-plugin-manifest: ^5.13.1 => 5.13.1 
    gatsby-plugin-postcss: ^6.13.1 => 6.13.1 
    gatsby-plugin-sanity-image: ^0.13.4 => 0.13.4 
    gatsby-plugin-sass: ^6.13.1 => 6.13.1 
    gatsby-plugin-sharp: ^5.13.1 => 5.13.1 
    gatsby-source-filesystem: ^5.13.1 => 5.13.1 
    gatsby-source-sanity: ^7.9.1 => 7.9.1 
    gatsby-source-wordpress: ^7.13.3 => 7.13.3 
    gatsby-transformer-sharp: ^5.13.1 => 5.13.1 
  npmGlobalPackages:
    gatsby-cli: 5.13.2

Config Flags

No response