# eXtremeDB Cluster Error Codes

> The following error codes indicate non-fatal error conditions that might be returned by the eXtremeDB Cluster runtime while processing Cluster operations:

> Mnemonic Constant Name
> Value
> Meaning
> MCO_E_CLUSTER
> 900
> Cluster Error Code base
> MCO_E_CLUSTER_NOT_INITIALIZED
> 901
> Non-cluster database
> MCO_E_CLUSTER_INVALID_PARAMETER
> 902
> Invalid cluster parameters value
> MCO_E_CLUSTER_STOPPED
> 903
> Replication was stopped
> MCO_E_CLUSTER_PROTOCOLERR
> 904
> Replication protocol error
> MCO_E_CLUSTER_NOQUORUM
> 905
> No node's quorum
> MCO_E_CLUSTER_BUSY
> 906
> Can't stop cluster with active transactions
> MCO_E_CLUSTER_INCOMPATIBLE_MODE
> 907
> Incompatible modes on different nodes
> MCO_E_CLUSTER_SYNC
> 908
> Error during synchronization
> MCO_E_CLUSTER_INCOMPATIBLE_ARCH
> 909
> Incompatible architecture of different nodes
> MCO_E_CLUSTER_DUPLICATE_NODEID
> 910
> Duplicate node ID

> MCO_E_CLUSTER_DDL_NOT_SUPPORTED

> 911

> DDL is not supported by Cluster

> Invalid return codes
> 912-998
> Values between 912 and 998 are not valid eXtremeDB return codes

> Related Topics