Improve error messages in config

**Problem**
When working with store, 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 configuration and store error-handling entry points in the repository and review how current messages are produced. Trace the relevant failure paths and identify the expected descriptive details; done means the affected errors provide clearer debugging context and the existing behavior remains covered.

Written by the indexing model from the issue text.