Update lib documentation

**Problem**
When working with config, 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 lib documentation and the configuration error-handling entry points. Review the current error messages and determine which configuration failures need more detail; done should mean the relevant documentation and messages clearly support debugging and maintenance.

Written by the indexing model from the issue text.