Optimize data for large datasets

**Problem**
When working with lib, 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 reading the lib area and tracing where the current error messages are produced. Identify the error-handling paths covered by the issue, then make their messages more descriptive and verify that debugging context is improved. No specific test or entry point is named, so the affected paths must be located first.

Written by the indexing model from the issue text.