{
    PA_OK = 0,                     /**< No error */
    PA_ERR_ACCESS,                 /**< Access failure */
    PA_ERR_COMMAND,                /**< Unknown command */
    PA_ERR_INVALID,                /**< Invalid argument */
    PA_ERR_EXIST,                  /**< Entity exists */
    PA_ERR_NOENTITY,               /**< No such entity */
    PA_ERR_CONNECTIONREFUSED,      /**< Connection refused */
    PA_ERR_PROTOCOL,               /**< Protocol error */
    PA_ERR_TIMEOUT,                /**< Timeout */
    PA_ERR_AUTHKEY,                /**< No authorization key */
    PA_ERR_INTERNAL,               /**< Internal error */
    PA_ERR_CONNECTIONTERMINATED,   /**< Connection terminated */
    PA_ERR_KILLED,                 /**< Entity killed */
    PA_ERR_INVALIDSERVER,          /**< Invalid server */
    PA_ERR_MODINITFAILED,          /**< Module initialization failed */
    PA_ERR_BADSTATE,               /**< Bad state */
    PA_ERR_NODATA,                 /**< No data */
    PA_ERR_VERSION,                /**< Incompatible protocol version */
    PA_ERR_TOOLARGE,               /**< Data too large */
    PA_ERR_NOTSUPPORTED,           /**< Operation not supported \since 0.9.5 */
    PA_ERR_UNKNOWN,                /**< The error code was unknown to the client */
    PA_ERR_NOEXTENSION,            /**< Extension does not exist. \since 0.9.12 */
    PA_ERR_MAX                     /**< Not really an error but the first invalid error code */
};