> For the complete documentation index, see [llms.txt](https://docs.aurelia.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aurelia.io/developer-guides/error-messages/router/aur3174.md).

# 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.


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