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        # reply handling...
      }
    );

# ERROR CODES

Every error object, passed to callback, contain error code, which can be used
for programmatic handling of errors. AnyEvent::RipeRedis provides constants for
error codes. They can be imported and used in expressions.

    use AnyEvent::RipeRedis qw( :err_codes );

- E\_CANT\_CONN

    Can't connect to the server. All operations were aborted.

- E\_LOADING\_DATASET

    Redis is loading the dataset in memory.

- E\_IO

    Input/Output operation error. The connection to the Redis server was closed and
    all operations were aborted.

- E\_CONN\_CLOSED\_BY\_REMOTE\_HOST

    The connection closed by remote host. All operations were aborted.

- E\_CONN\_CLOSED\_BY\_CLIENT

    Connection closed by client prematurely. Uncompleted operations were aborted.

- E\_NO\_CONN

    No connection to the Redis server. Connection was lost by any reason on previous
    operation.

- E\_OPRN\_ERROR

    Operation error. For example, wrong number of arguments for a command.

- E\_UNEXPECTED\_DATA

    The client received unexpected reply from the server. The connection to the Redis
    server was closed and all operations were aborted.

- E\_READ\_TIMEDOUT

    Read timed out. The connection to the Redis server was closed and all operations
    were aborted.

Error codes available since Redis 2.6.

- E\_NO\_SCRIPT

    No matching script. Use the `EVAL` command.

- E\_BUSY

    Redis is busy running a script. You can only call `SCRIPT KILL`
    or `SHUTDOWN NOSAVE`.

- E\_NOT\_BUSY

    No scripts in execution right now.

- E\_MASTER\_DOWN

    Link with MASTER is down and slave-serve-stale-data is set to 'no'.

- E\_MISCONF

    Redis is configured to save RDB snapshots, but is currently not able to persist
    on disk. Commands that may modify the data set are disabled. Please check Redis
    logs for details about the error.

- E\_READONLY

    You can't write against a read only slave.

- E\_OOM

    Command not allowed when used memory > 'maxmemory'.

- E\_EXEC\_ABORT

    Transaction discarded because of previous errors.

Error codes available since Redis 2.8.

- E\_NO\_AUTH

    Authentication required.

- E\_WRONG\_TYPE

    Operation against a key holding the wrong kind of value.

- E\_NO\_REPLICAS

    Not enough good slaves to write.

- E\_BUSY\_KEY

    Target key name already exists.

Error codes available since Redis 3.0.

- E\_CROSS\_SLOT

    Keys in request don't hash to the same slot.

- E\_TRY\_AGAIN

    Multiple keys request during rehashing of slot.

- E\_ASK

    Redirection required. For more information see:
    [http://redis.io/topics/cluster-spec](http://redis.io/topics/cluster-spec)