Print error output on one line

[davidpdrsn]

Checklist

• [x] I have read the Contributor Guide
• [x] I have read and agree to the Code of Conduct
• [x] I have added a description of my changes and why I'd like them included in the section below

Description of Changes

If an error bubles all the way up to main we would previously print it across several lines. That makes things harder to search for in the logs.

This changes it so the error (including the source chain) is printed on one line.