What does the error "404 Frontend Only" mean in Vue SPA router when using history mode?

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The error "404 Frontend Only" in Vue SPA router when using history mode typically means that the server has been configured incorrectly. When using history mode, the Vue application relies on the server to handle all requests correctly. If the server is not configured to serve the correct URL for each route, the Vue router will not be able to load the correct page, resulting in a 404 error.

In order to fix this error, you need to ensure that the server is correctly configured to serve the correct URL for each route. This may involve setting up rewrites or redirects in your server configuration, or ensuring that your server is configured to serve all requests to the index.html file so that the Vue router can handle them correctly.