Error database
Paper, Purpur and Velocity errors — with cause and fix
The signed signature database the Tickwise agent uses to recognise failures. Find a line from your log and see what broke and how to fix it.
- signatures
- 42
- critical
- 15
- categories
- 10
Startup3
- CriticalSIG-ST-001Java too old for the server or a plugin (UnsupportedClassVersionError)
has been compiled by a more recent version of the Java RuntimePaperPurpur - CriticalSIG-ST-003The server cannot bind its port (FAILED TO BIND TO PORT)
FAILED TO BIND TO PORT!PaperPurpur - CriticalSIG-ST-011Paper refused to start on a pre-release Java (Unsupported Java detected)
You are running an unsupported, non official, version.PaperPurpur
Velocity & proxy6
- CriticalSIG-VE-001Modern forwarding mismatch between Velocity and the backend
Your server did not send a forwarding request to the proxyVelocity - CriticalSIG-VE-002Velocity forwarding secret does not match the backend's secret
Unable to verify player detailsPaperPurpurVelocity - CriticalSIG-VE-004Legacy (BungeeCord) forwarding mismatch between Velocity and the backend
If you wish to use IP forwarding, please enable it in your BungeeCord config as well!Velocity - CriticalSIG-VE-012Velocity will not start: no forwarding secret set
You don't have a forwarding secret setVelocity - ErrorSIG-VE-003Velocity cannot connect the player to the backend (backend unreachable)
unable to connect to serverVelocity - ErrorSIG-VE-013Backend connection dropped mid-session
encountered a problem.Velocity
Plugins10
- ErrorSIG-PL-001Plugin not loaded: a required dependency is missing (UnknownDependencyException)
UnknownDependencyException: UnknownPaperPurpur - ErrorSIG-PL-002A file in plugins/ is not a plugin, or its plugin.yml is corrupted
Could not determine plugin typePaperPurpur - ErrorSIG-PL-004Plugin crashed while enabling (Error occurred while enabling)
while enablingPaperPurpur - ErrorSIG-PL-005Plugin incompatible with the server version (NoSuchMethodError/NoClassDefFoundError on API/NMS)
java.lang.NoSuchMethodError: 'PaperPurpur - ErrorSIG-PL-006Plugin requires a newer server version (Unsupported API version)
Unsupported API versionPaperPurpur - ErrorSIG-PL-010Recurring exceptions in a plugin's scheduler tasks (Task #N generated an exception)
generated an exceptionPaperPurpur - ErrorSIG-PL-011Exception in a plugin's event handler (Could not pass event)
Could not pass eventPaperPurpur - ErrorSIG-PL-012A plugin calls the server API off the main thread (Asynchronous …!)
java.lang.IllegalStateException:PaperPurpur - ErrorSIG-PL-020Plugin crashed while disabling (Error occurred while disabling)
while disablingPaperPurpur - WarningSIG-PL-003Duplicate plugin: two jars with the same name (Ambiguous plugin name)
Ambiguous plugin namePaperPurpur
Performance4
- CriticalSIG-PA-002Watchdog: the server has hung and will be stopped (The server has stopped responding!)
The server has stopped responding!PaperPurpur - CriticalSIG-PA-006Vanilla watchdog: a single tick took too long, the server was force-stopped
A single server tick tookPaperPurpur - WarningSIG-PA-001The server cannot keep up with ticks (Can't keep up!)
Can't keep up! Is the server overloaded?PaperPurpur - WarningSIG-PA-007Early watchdog warning: a tick has run for over 10 seconds (Creating thread dump)
has not responded forPaperPurpur
Memory4
- CriticalSIG-MEM-001Out of heap memory (OutOfMemoryError: Java heap space)
java.lang.OutOfMemoryError:PaperPurpur - CriticalSIG-MEM-002Metaspace exhausted (OutOfMemoryError: Metaspace)
java.lang.OutOfMemoryError:PaperPurpur - CriticalSIG-MEM-003The JVM cannot create a thread (OutOfMemoryError: unable to create native thread)
native threadPaperPurpur - CriticalSIG-MEM-004Direct memory exhausted (OutOfMemoryError: direct buffer memory)
java.lang.OutOfMemoryError:PaperPurpur
Databases9
- ErrorSIG-DB-001Database unreachable (MySQL: Communications link failure / MariaDB: Socket fail to connect)
Communications link failurePaperPurpurVelocity - ErrorSIG-DB-002Database connection pool exhausted (HikariCP: Connection is not available)
Connection is not available, request timed out afterPaperPurpurVelocity - ErrorSIG-DB-003Wrong database credentials or privileges (Access denied for user)
Access denied for user 'PaperPurpurVelocity - ErrorSIG-DB-004Database connection limit exceeded (Too many connections)
Too many connectionsPaperPurpurVelocity - ErrorSIG-DB-005Stale MySQL connections (The last packet successfully received … milliseconds ago)
The last packet successfully received from the server wasPaperPurpurVelocity - ErrorSIG-DB-006MySQL 8: Public Key Retrieval is not allowed
Public Key Retrieval is not allowedPaperPurpurVelocity - ErrorSIG-DB-007SQLite locked (SQLITE_BUSY: database is locked)
database is lockedPaperPurpurVelocity - WarningSIG-DB-011The JVM “froze”: HikariCP Thread starvation or clock leap detected
Thread starvation or clock leap detectedPaperPurpurVelocity - WarningSIG-DB-012Database connection leak (HikariCP: Apparent connection leak detected)
Connection leak detection triggered forPaperPurpurVelocity
World & chunks3
- ErrorSIG-WO-001Corrupted chunks or region files: chunk data lost
chunk data will be lostPaperPurpur - ErrorSIG-WO-006An entity or block entity throws an exception while ticking (Entity/BlockEntity threw exception)
threw exception atPaperPurpur - ErrorSIG-WO-008Chunk not saved (Failed to save chunk)
Failed to save chunkPaperPurpur
Network1
Authentication1
Disk1
signature pack 2026.09.24-1 · Ed25519