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Server Won’t Start

Your server won’t start? Here’s how to diagnose and fix the issue.

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Check the Console

The console provides the most important clues:
  1. Go to Console tab
  2. Click Start
  3. Watch for error messages
  4. Note any red/error text

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Common Causes & Solutions

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1. Configuration File Error

Symptoms: 
Error parsing config
Invalid configuration
JSON/YAML parse error
Solution:
  1. Find the config file mentioned
  2. Check for syntax errors
  3. Validate JSON at jsonlint.com
  4. Validate YAML at yamllint.com
  5. Fix errors and restart

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2. EULA Not Accepted (Minecraft)

Symptoms: 
You need to agree to the EULA
Solution:
  1. Open File Manager
  2. Open eula.txt
  3. Change eula=false to eula=true
  4. Save and restart

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3. Corrupted Server Files

Symptoms: 
Invalid or corrupt jarfile
Failed to load assembly
Missing required files
Solution:
  1. Backup your world/data
  2. Go to Settings
  3. Click “Reinstall Server”
  4. Restore your data

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4. Out of Memory

Symptoms: 
java.lang.OutOfMemoryError
Out of memory
Cannot allocate memory
Solution:
  • Upgrade to a plan with more RAM
  • Remove memory-heavy mods/plugins
  • Reduce view distance and entity limits

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5. Port Already in Use

Symptoms: 
Failed to bind to port
Address already in use
Port is already allocated
Solution:
  1. Wait 1-2 minutes (old process may still be closing)
  2. Try starting again
  3. Contact support if persists

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6. Java Version Mismatch (Minecraft)

Symptoms: 
UnsupportedClassVersionError
Unsupported major.minor version
JNI error
Solution:
  1. Check Minecraft version requirements:
    • 1.17-1.20.4: Java 17
    • 1.20.5+: Java 21
    • 1.16.5 and below: Java 8/11
  2. Contact support to change Java version

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7. Missing Dependencies

Symptoms: 
Missing required mod/plugin
Dependency not found
Requires: [mod name]
Solution:
  1. Identify required dependency
  2. Download and install it
  3. Restart server

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8. Mod/Plugin Crash

Symptoms: 
Caused by: [mod/plugin name]
Exception in mod
Plugin failed to load
Solution:
  1. Remove the problematic mod/plugin
  2. Check for updates
  3. Verify version compatibility
  4. Report to mod/plugin author

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9. World Corruption

Symptoms: 
Failed to load world
Region file corrupted
Chunk loading error
Solution:
  1. Restore from backup
  2. Or delete world to regenerate
  3. Contact support for recovery options

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10. Disk Space Full

Symptoms: 
No space left on device
Disk quota exceeded
Solution:
  1. Delete old backups
  2. Remove old logs
  3. Delete unnecessary files
  4. Upgrade plan if needed

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Still Won’t Start?

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Collect Information

  1. Copy full console output
  2. Note any changes made before issue
  3. List installed mods/plugins

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Contact Support

Provide:
  • Server type and version
  • Full error message
  • What you’ve already tried