Improve error messages in handlers

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

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

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

Start by locating the handlers and hook entry points mentioned in the issue and reproduce the current errors. Define which failures need more detail, then add focused coverage where the existing handler or hook behavior is tested; done means the relevant errors provide descriptive debugging context.

Written by the indexing model from the issue text.