Support import configuration

**Problem**
When working with middleware, 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 middleware and its current error-handling paths in the repository, then reproduce the relevant failures to understand what context is missing. Review the existing error output and document which cases need more detail; done means middleware failures provide useful, consistent messages that improve debugging.

Written by the indexing model from the issue text.