# AUR3401 ## Error Message `AUR3401: Neither the route '%s' matched any configured route at '%s' nor a fallback is configured for the viewport '%s' - did you forget to add '%s' to the routes list of the route decorator of '%s'?` ## Description This error occurs when the router cannot recognize the requested route and there is no fallback configured for the target viewport. ## Common Scenarios * Navigating to a path that is not configured in the route table. * Forgetting to register a routed component (or its routes) in the correct routing context. ## Solutions * Add the missing route to your route configuration. * Ensure the component that owns the routes is registered/active for the current navigation. * Configure a fallback route for the viewport if desired. ## Troubleshooting * Check the path you are navigating to and compare it with configured routes. * Verify the component mentioned in the last `%s` has the route configured. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.aurelia.io/developer-guides/error-messages/router/aur3401.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.