Minecraft troubleshooting guides
Step-by-step fixes for crashes, boot loops and servers your players can't reach.
All 23 troubleshooting guides
Failed to initialize server: players folder
Minecraft server stops with DETECTED OLD PLAYER DIRECTORY IN THE WORLD SAVE? Move the leftover players folder out of your world, then start it again.
Failed to load properties from file: fix server.properties
Minecraft server missing its server.properties file? Restart it once, then check the port and bring back any settings that went to defaults.
Find Minecraft server logs and crash reports
Where latest.log and crash-reports live on a Minecraft server, how to download them from the Console or File Manager, and how to read a crash report.
Fix "Failed to bind to port" on Minecraft
Why Minecraft says FAILED TO BIND TO PORT on our servers, and how to clear a stuck process or an add-on set to the same port.
Fix "Failed to verify username" on Minecraft
Why a Minecraft server says Failed to verify username, the fixes for the player, and what switching off online mode really costs you.
Fix "Internal Exception" on Minecraft
Read the Internal Exception screen, tell a server fault from a player's connection, and fix dropped connections on your Minecraft server.
Fix "Kicked by an operator" on Minecraft
Find out what kicked a Minecraft player with Kicked by an operator, whether a command, a plugin or a schedule, and stop it from happening again.
Fix a Minecraft server that will not start
Read the Minecraft Console for the first real error, match the message to a fix, and undo your last change in the safe order, from add-ons to backups.
Fix Minecraft "Exception in server tick loop" crash
Find the crash report for Exception in Minecraft server tick loop, read the real cause out of it, and fix mods, memory, disk and watchdog crashes.
Fix Minecraft "Failed to check session.lock" error
What the session lock messages mean in each Minecraft version, and how to stop the server cleanly and clear session.lock safely.
Fix Minecraft "Incomplete set of tags received"
A player is kicked with Incomplete set of tags received from the Minecraft server. See what it means and how to match mods, data packs and versions.
Fix Minecraft "ZIP END header not found" jar errors
What zip END header not found, Unable to access jarfile and Invalid or corrupt jarfile mean on a Minecraft server, and how to replace the broken jar.
11 more guides
- Fix Minecraft corrupted chunks and region files
- Fix mod and plugin errors on Minecraft
- Fix No key dimensions in MapLike (level.dat)
- Fix the Minecraft "missing the following mods" error
- Fix the Minecraft mismatched mod channel list error
- Fix ticking entity crashes on modded Minecraft servers
- Java 21 to Java 25 on your Minecraft server
- Minecraft server exit codes 1, 137 and 143
- Overworld settings missing after leaving Paper
- Reload chunks on your Minecraft server
- Set Minecraft PluginClassLoader as parallel capable