Update parsers documentation

**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.

No files or tests are named. Start by locating the parsers documentation and the store-related error handling, then compare the current messages with the requested debugging context. Done means the relevant documentation and error descriptions clearly explain parser or store failures.

Written by the indexing model from the issue text.