If you encounter an issue with your Gatsby Preview instance not updating, check the Preview Logs for errors. In this section, we’ll document common issues you might encounter, along with solutions and workarounds.
If you are getting general build errors, this can often mean that your environment variables aren’t set correctly. If you run into a build error, go to the
Settings tab for your site and ensure the environment variables are correct and match you
Problem: Gatsby Preview will log an error saying TypeError: Cannot read property ‘bitmap’ of undefined.
Restart on the site