# AUR3174 ## Error Message ``` AUR3174: Failed to resolve %s at: %s ``` ## Description This error occurs when the router cannot resolve a suitable viewport agent for a navigation request, often because no viewport is available that matches the instruction, or the router tree is not in the expected state. ## Solutions * Ensure the app has an active viewport setup that can host the navigation target. * Ensure the requested viewport name(s) match what is configured in the view. ## Troubleshooting * Review the printed tree/path in the error for where resolution failed. * Verify viewport names and router configuration. --- # 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/aur3174.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.