Translate a Wall of Technical Error Logs Into What Actually Broke

The log has forty lines of red text, most of it noise thrown off by the one thing that actually broke first. This translates the wall of text into plain language: what failed, where, and which error is the root cause versus which ones are just the fallout.

Paste the error log or stack trace below. Translate it into plain language: what actually failed, where in the process it failed, and the most likely root cause based on the error text. If there are multiple errors, identify which one is the original cause and which are downstream consequences of it.