Improve error messages in config

**Problem**
When working with models, 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 file, entry point, or test is identified. Start by locating the configuration and model error-handling paths in the repository, then inspect existing error-message tests if present. Done means the relevant errors provide more descriptive debugging information and the affected behavior is covered by tests.

Written by the indexing model from the issue text.