Improve error messages in components

**Problem**
When working with controllers, 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, or entry points are named. Start by locating the controller error-handling paths in the project and trace how their current messages are produced. Done means controller failures provide the requested additional detail and the affected behavior is covered by the project's existing checks.

Written by the indexing model from the issue text.