Handle edge cases in caching

**Problem**
When working with routes, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

No files, tests, commands, or reproducible route-caching case are identified. Start by locating the route and caching implementation, then reproduce the reported error behavior and determine the intended descriptive messages. Done means the relevant edge cases are covered and error output is more useful for debugging.

Written by the indexing model from the issue text.