# AUR3350 ## Error Message `AUR3350: Unexpected viewport activation outside of a transition context at %s` ## Description This error indicates the router attempted to activate a viewport outside of an active transition context. In normal application code this should not happen and usually indicates an internal state problem. ## Troubleshooting * If you can reproduce this reliably, please report it with a minimal reproduction. * Check for custom integrations that call viewport agent APIs directly. --- # 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/aur3350.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.