Your site's "gatsby-node.js" created a page with a component that doesn't exist.
The path to the missing component is "C:\Users\lishuaibing\Desktop\avatar-generator\src\pages\page_404.bs.js"
The page object passed to createPage:
{
"path": "404",
"component": "C:\Users\lishuaibing\Desktop\avatar-generator\src\pages\page_404.bs.js"
}
See the documentation for the "createPage" action — https://www.gatsbyjs.org/docs/actions/#createPage
not finished createPages - 0.043s
error Command failed with exit code 1.