# What are the client error codes for Aerospike 2.x? **URL:** \ **Category:** Client Libraries\ **Created:** [August 16, 2014, 1:09am UTC](https://discuss.aerospike.com/t/what-are-the-client-error-codes-for-aerospike-2-x/289 "2014-08-16T01:09:02Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Clairerospike](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/clairerospike/32/30_2.png) [@Clairerospike](https://discuss.aerospike.com/u/Clairerospike)\ **Post date:** [August 16, 2014, 1:09am UTC](https://discuss.aerospike.com/t/what-are-the-client-error-codes-for-aerospike-2-x/289/1 "2014-08-16T01:09:02Z")
What are the client error codes as returned from the cluster? ---
**Author:** ![Clairerospike](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/clairerospike/32/30_2.png) [@Clairerospike](https://discuss.aerospike.com/u/Clairerospike)\ **Post date:** [August 16, 2014, 1:09am UTC](https://discuss.aerospike.com/t/what-are-the-client-error-codes-for-aerospike-2-x/289/2 "2014-08-16T01:09:14Z")
The most recent list of error codes can be found at: [https://docs.aerospike.com/display/AS2/Return+Error+Codes](https://docs.aerospike.com/display/AS2/Return+Error+Codes) As of April 2013, the current list is: 1 = Unknown failure. Consider retry 2 = Key Not Found error. The key may have been deleted or evicted already. 3 = Failed Generation error. This implies that another client has already used that same key you have attempted to write. 4 = Failed Parameter. Check client parameters and verify each is supported by current client version 5 = Key Exists error. Key already exists 6 = Bin Exists error. This happens when a bin exists and the key is being written to a bin that is defined as unique. 7 = Cluster key mismatch error. This can happen when a node was brought down temporarily then brought back up. It can also happen when the key no longer exists because it has been evicted. 8 = Partition out of space error. Occurs when the high-water mark has been reached and namespace no longer can accept write requests. 9 = Timeout error. Consider retry 10 = No XDR error. XDR process is not running. Consider starting it back up. 11 = Unavailable error. Server error when node is down and partition is not available 12 = Incompatible type error. The operand and bin types are not compatible and mismatched. 13 = Record Too big error. The size of the object or record is exceeding the limit, currently at 1MB. 14 = Key Busy error. This is most likely caused by a ‘hotkey’ and will affect the clients doing reads or writes. It happens when a key is accessed simultaneously more than “transaction-pending-limit” times. young Posts: 210 Joined: Thu Oct 04, 2012 5:19 pm