This is a list of the SDK error codes, valid for build 31:
RC_SUCCESS = 0; RC_CITIZENSHIP_EXPIRED = 1; RC_LAND_LIMIT_EXCEEDED = 2; RC_NO_SUCH_CITIZEN = 3; RC_MESSAGE_LENGTH_BAD = 4; RC_LICENSE_PASSWORD_CONTAINS_SPACE = 5; RC_LICENSE_PASSWORD_TOO_LONG = 6; RC_LICENSE_PASSWORD_TOO_SHORT = 7; RC_LICENSE_RANGE_TOO_LARGE = 8; RC_LICENSE_RANGE_TOO_SMALL = 9; RC_LICENSE_USERS_TOO_LARGE = 10; RC_LICENSE_USERS_TOO_SMALL = 11; RC_LICENSE_CONTAINS_INVALID_CHAR = 12; RC_INVALID_PASSWORD = 13; RC_UNABLE_TO_MAIL_BACK_NUMBER = 14; RC_LICENSE_WORLD_TOO_SHORT = 15; RC_LICENSE_WORLD_TOO_LONG = 16; RC_SERVER_OUT_OF_MEMORY = 17; RC_INVALID_WORLD = 20; RC_SERVER_OUTDATED = 21; RC_WORLD_ALREADY_STARTED = 22; RC_NO_SUCH_WORLD = 27; RC_NOT_LOGGED_IN = 31; RC_UNAUTHORIZED = 32; RC_WORLD_ALREADY_EXISTS = 33; RC_NO_SUCH_LICENSE = 34; RC_IDENTITY_ALREADY_IN_USE = 39; RC_UNABLE_TO_REPORT_LOCATION = 40; RC_INVALID_EMAIL = 41; RC_NO_SUCH_ACTING_CITIZEN = 42; RC_ACTING_PASSWORD_INVALID = 43; RC_UNIVERSE_FULL = 45; RC_BILLING_TIMEOUT = 46; RC_BILLING_RECV_FAILED = 47; RC_BILLING_RESPONSE_INVALID = 48; RC_BILLING_REJECTED = 55; RC_BILLING_BLOCKED = 56; RC_TOO_MANY_WORLDS = 57; RC_MUST_UPGRADE = 58; RC_BOT_LIMIT_EXCEEDED = 59; RC_WORLD_EXPIRED = 61; RC_CITIZEN_DOES_NOT_EXPIRE = 62; RC_LICENSE_STARTS_WITH_NUMBER = 64; RC_NO_SUCH_EJECTION = 66; RC_NO_SUCH_SESSION = 67; RC_EJECTION_EXPIRED = 69; RC_ACTING_CITIZEN_EXPIRED = 70; RC_ALREADY_STARTED = 71; RC_WORLD_RUNNING = 72; RC_WORLD_NOT_SET = 73; RC_NO_SUCH_CELL = 74; RC_NO_REGISTRY = 75; // RC_CANT_OPEN_REGISTRY = 76; // RC_CITIZEN_DISABLED = 77; RC_WORLD_DISABLED = 78; RC_BETA_REQUIRED = 79; RC_ACTING_CITIZEN_DISABLED = 80; RC_INVALID_USER_COUNT = 81; RC_PRIVATE_WORLD = 91; RC_NO_TOURISTS = 92; RC_EMAIL_CONTAINS_INVALID_CHAR = 100; RC_EMAIL_ENDS_WITH_BLANK = 101; RC_EMAIL_MISSING_DOT = 102; RC_EMAIL_MISSING_AT = 103; RC_EMAIL_STARTS_WITH_BLANK = 104; RC_EMAIL_TOO_LONG = 105; RC_EMAIL_TOO_SHORT = 106; RC_NAME_ALREADY_USED = 107; RC_NAME_CONTAINS_NONALPHANUMERIC_CHAR = 108; RC_NAME_CONTAINS_INVALID_BLANK = 109; RC_NAME_DOESNT_EXIST = 110; // RC_NAME_ENDS_WITH_BLANK = 111; RC_NAME_TOO_LONG = 112; RC_NAME_TOO_SHORT = 113; RC_NAME_UNUSED = 114; // RC_PASSWORD_TOO_LONG = 115; RC_PASSWORD_TOO_SHORT = 116; RC_PASSWORD_WRONG = 117; RC_UNABLE_TO_DELETE_NAME = 119; RC_UNABLE_TO_GET_CITIZEN = 120; RC_UNABLE_TO_INSERT_CITIZEN = 121; RC_UNABLE_TO_INSERT_NAME = 122; RC_UNABLE_TO_PUT_CITIZEN_COUNT = 123; RC_UNABLE_TO_DELETE_CITIZEN = 124; RC_NUMBER_ALREADY_USED = 126; RC_NUMBER_OUT_OF_RANGE = 127; RC_PRIVILEGE_PASSWORD_IS_TOO_SHORT = 128; RC_PRIVILEGE_PASSWORD_IS_TOO_LONG = 129; RC_OLD_DATABASE = 130; // RC_START_TRANSACT_FAILED = 131; // RC_NOT_CHANGE_OWNER = 203; RC_CANT_FIND_OLD_ELEMENT = 204; RC_UNABLE_TO_CHANGE_ATTRIBUTE = 210; RC_CANT_CHANGE_OWNER = 211; RC_IMPOSTER = 212; RC_INVALID_REQUEST = 213; RC_CANT_BUILD_HERE = 216; RC_NOT_ALLOWED = 232; // RC_ENCROACHES = 300; RC_NO_SUCH_OBJECT = 301; RC_NOT_DELETE_OWNER = 302; RC_TOO_MANY_BYTES = 303; RC_UNABLE_TO_STORE = 305; RC_UNREGISTERED_OBJECT = 306; RC_ELEMENT_ALREADY_EXISTS = 308; RC_RESTRICTED_COMMAND = 309; RC_NO_BUILD_RIGHTS = 310; RC_OUT_OF_BOUNDS = 311; RC_RESTRICTED_OBJECT = 313; RC_RESTRICTED_AREA = 314; RC_OUT_OF_MEMORY = 400; RC_NOT_YET = 401; RC_TIMEOUT = 402; RC_NULL_POINTER = 403; RC_UNABLE_TO_CONTACT_UNIVERSE = 404; RC_UNABLE_TO_CONTACT_WORLD = 405; RC_INVALID_WORLD_NAME = 406; RC_SEND_FAILED = 415; RC_RECEIVE_FAILED = 416; RC_STREAM_EMPTY = 421; RC_STREAM_MESSAGE_TOO_LONG = 422; RC_WORLD_NAME_TOO_LONG = 423; RC_MESSAGE_TOO_LONG = 426; RC_TOO_MANY_RESETS = 427; RC_UNABLE_TO_CREATE_SOCKET = 428; RC_UNABLE_TO_CONNECT = 429; RC_UNABLE_TO_SET_NONBLOCKING = 430; RC_CANT_OPEN_STREAM = 434; RC_CANT_WRITE_STREAM = 435; RC_CANT_CLOSE_STREAM = 436; RC_NO_CONNECTION = 439; RC_UNABLE_TO_INITIALIZE_NETWORK = 442; RC_INCORRECT_MESSAGE_LENGTH = 443; RC_NOT_INITIALIZED = 444; RC_NO_INSTANCE = 445; RC_OUT_BUFFER_FULL = 446; RC_INVALID_CALLBACK = 447; RC_INVALID_ATTRIBUTE = 448; RC_TYPE_MISMATCH = 449; RC_STRING_TOO_LONG = 450; RC_READ_ONLY = 451; RC_UNABLE_TO_REGISTER_RESOLVE = 452; RC_INVALID_INSTANCE = 453; RC_VERSION_MISMATCH = 454; RC_IN_BUFFER_FULL = 461; RC_PROTOCOL_ERROR = 463; RC_QUERY_IN_PROGRESS = 464; RC_WORLD_FULL = 465; RC_EJECTED = 466; RC_NOT_WELCOME = 467; RC_UNABLE_TO_BIND = 468; RC_UNABLE_TO_LISTEN = 469; RC_UNABLE_TO_ACCEPT = 470; RC_CONNECTION_LOST = 471; RC_NO_STREAM = 473; RC_NOT_AVAILABLE = 474; RC_OLD_UNIVERSE = 487; RC_OLD_WORLD = 488; RC_WORLD_NOT_RUNNING = 489; RC_INVALID_ARGUMENT = 505;