Are the red startup lines / warnings normal?
If your console lights up with yellow warnings and even a few red lines during startup, it's natural to worry. The good news: many of those lines are perfectly normal and don't stop your server from running. This guide helps you tell routine startup noise from a real failure.
Why red and yellow lines appear
Servers print warnings (yellow) and even some non-fatal errors (red) while they boot. Common harmless causes include missing optional configs, deprecation notices, and a plugin's own logging. None of these prevent the server from starting.
How to tell if it's a problem
- Watch the Console until startup finishes.
- Look for the "Done" line — if the server reaches "Done" and you can join, everything is fine.
- Only worry about red lines that end in a crash or "Failed to start."
- If you're unsure, use the Console's "Share logs via mclo.gs" button and send us the link.
Tip: A single red line partway through boot is not a crash. Judge the server by whether it finishes starting and stays online.
Frequently asked questions
The server says "Done" but I still see red lines. Is that okay? Yes. If it reached "Done" and you can join, those lines are informational.
When should I actually be concerned? When a red error is followed by a stack trace and the server stops, or when you see "Failed to start." Share that via mclo.gs so we can read it.
Can I remove the warnings? Some come from optional configs or plugin settings you can adjust, but they're safe to leave. Don't chase every message.