MT4 error codes, in MQL4's words

161 codes match.

• 0

  ERR_NO_ERROR

  No error returned

  Cause and fix

• 1

  ERR_NO_RESULT

  No error returned, but the result is unknown

  Cause and fix

• 2

  ERR_COMMON_ERROR

  Common error

  Cause and fix

• 3

  ERR_INVALID_TRADE_PARAMETERS

  Invalid trade parameters

  Cause and fix

• 4

  ERR_SERVER_BUSY

  Trade server is busy

• 5

  ERR_OLD_VERSION

  Old version of the client terminal

• 6

  ERR_NO_CONNECTION

  No connection with trade server

• 7

  ERR_NOT_ENOUGH_RIGHTS

  Not enough rights

• 8

  ERR_TOO_FREQUENT_REQUESTS

  Too frequent requests

• 9

  ERR_MALFUNCTIONAL_TRADE

  Malfunctional trade operation

• 64

  ERR_ACCOUNT_DISABLED

  Account disabled

• 65

  ERR_INVALID_ACCOUNT

  Invalid account

• 128

  ERR_TRADE_TIMEOUT

  Trade timeout

• 129

  ERR_INVALID_PRICE

  Invalid price

• 130

  ERR_INVALID_STOPS

  Invalid stops

  Cause and fix

• 131

  ERR_INVALID_TRADE_VOLUME

  Invalid trade volume

  Cause and fix

• 132

  ERR_MARKET_CLOSED

  Market is closed

  Cause and fix

• 133

  ERR_TRADE_DISABLED

  Trade is disabled

  Cause and fix

• 134

  ERR_NOT_ENOUGH_MONEY

  Not enough money

  Cause and fix

• 135

  ERR_PRICE_CHANGED

  Price changed

• 136

  ERR_OFF_QUOTES

  Off quotes

  Cause and fix

• 137

  ERR_BROKER_BUSY

  Broker is busy

• 138

  ERR_REQUOTE

  Requote

• 139

  ERR_ORDER_LOCKED

  Order is locked

• 140

  ERR_LONG_POSITIONS_ONLY_ALLOWED

  Buy orders only allowed

• 141

  ERR_TOO_MANY_REQUESTS

  Too many requests

• 145

  ERR_TRADE_MODIFY_DENIED

  Modification denied because order is too close to market

• 146

  ERR_TRADE_CONTEXT_BUSY

  Trade context is busy

• 147

  ERR_TRADE_EXPIRATION_DENIED

  Expirations are denied by broker

• 148

  ERR_TRADE_TOO_MANY_ORDERS

  The amount of open and pending orders has reached the limit set by the broker

• 149

  ERR_TRADE_HEDGE_PROHIBITED

  An attempt to open an order opposite to the existing one when hedging is disabled

• 150

  ERR_TRADE_PROHIBITED_BY_FIFO

  An attempt to close an order contravening the FIFO rule

• 4000

  ERR_NO_MQLERROR

  No error returned

• 4001

  ERR_WRONG_FUNCTION_POINTER

  Wrong function pointer

• 4002

  ERR_ARRAY_INDEX_OUT_OF_RANGE

  Array index is out of range

• 4003

  ERR_NO_MEMORY_FOR_CALL_STACK

  No memory for function call stack

• 4004

  ERR_RECURSIVE_STACK_OVERFLOW

  Recursive stack overflow

• 4005

  ERR_NOT_ENOUGH_STACK_FOR_PARAM

  Not enough stack for parameter

• 4006

  ERR_NO_MEMORY_FOR_PARAM_STRING

  No memory for parameter string

• 4007

  ERR_NO_MEMORY_FOR_TEMP_STRING

  No memory for temp string

• 4008

  ERR_NOT_INITIALIZED_STRING

  Not initialized string

• 4009

  ERR_NOT_INITIALIZED_ARRAYSTRING

  Not initialized string in array

• 4010

  ERR_NO_MEMORY_FOR_ARRAYSTRING

  No memory for array string

• 4011

  ERR_TOO_LONG_STRING

  Too long string

• 4012

  ERR_REMAINDER_FROM_ZERO_DIVIDE

  Remainder from zero divide

• 4013

  ERR_ZERO_DIVIDE

  Zero divide

• 4014

  ERR_UNKNOWN_COMMAND

  Unknown command

• 4015

  ERR_WRONG_JUMP

  Wrong jump (never generated error)

• 4016

  ERR_NOT_INITIALIZED_ARRAY

  Not initialized array

• 4017

  ERR_DLL_CALLS_NOT_ALLOWED

  DLL calls are not allowed

• 4018

  ERR_CANNOT_LOAD_LIBRARY

  Cannot load library

• 4019

  ERR_CANNOT_CALL_FUNCTION

  Cannot call function

• 4020

  ERR_EXTERNAL_CALLS_NOT_ALLOWED

  Expert function calls are not allowed

• 4021

  ERR_NO_MEMORY_FOR_RETURNED_STR

  Not enough memory for temp string returned from function

• 4022

  ERR_SYSTEM_BUSY

  System is busy (never generated error)

• 4023

  ERR_DLLFUNC_CRITICALERROR

  DLL-function call critical error

• 4024

  ERR_INTERNAL_ERROR

  Internal error

• 4025

  ERR_OUT_OF_MEMORY

  Out of memory

• 4026

  ERR_INVALID_POINTER

  Invalid pointer

• 4027

  ERR_FORMAT_TOO_MANY_FORMATTERS

  Too many formatters in the format function

• 4028

  ERR_FORMAT_TOO_MANY_PARAMETERS

  Parameters count exceeds formatters count

• 4029

  ERR_ARRAY_INVALID

  Invalid array

• 4030

  ERR_CHART_NOREPLY

  No reply from chart

• 4050

  ERR_INVALID_FUNCTION_PARAMSCNT

  Invalid function parameters count

• 4051

  ERR_INVALID_FUNCTION_PARAMVALUE

  Invalid function parameter value

  Cause and fix

• 4052

  ERR_STRING_FUNCTION_INTERNAL

  String function internal error

• 4053

  ERR_SOME_ARRAY_ERROR

  Some array error

• 4054

  ERR_INCORRECT_SERIESARRAY_USING

  Incorrect series array using

• 4055

  ERR_CUSTOM_INDICATOR_ERROR

  Custom indicator error

• 4056

  ERR_INCOMPATIBLE_ARRAYS

  Arrays are incompatible

• 4057

  ERR_GLOBAL_VARIABLES_PROCESSING

  Global variables processing error

• 4058

  ERR_GLOBAL_VARIABLE_NOT_FOUND

  Global variable not found

• 4059

  ERR_FUNC_NOT_ALLOWED_IN_TESTING

  Function is not allowed in testing mode

• 4060

  ERR_FUNCTION_NOT_CONFIRMED

  Function is not allowed for call

• 4061

  ERR_SEND_MAIL_ERROR

  Send mail error

• 4062

  ERR_STRING_PARAMETER_EXPECTED

  String parameter expected

• 4063

  ERR_INTEGER_PARAMETER_EXPECTED

  Integer parameter expected

• 4064

  ERR_DOUBLE_PARAMETER_EXPECTED

  Double parameter expected

• 4065

  ERR_ARRAY_AS_PARAMETER_EXPECTED

  Array as parameter expected

• 4066

  ERR_HISTORY_WILL_UPDATED

  Requested history data is in updating state

• 4067

  ERR_TRADE_ERROR

  Internal trade error

• 4068

  ERR_RESOURCE_NOT_FOUND

  Resource not found

• 4069

  ERR_RESOURCE_NOT_SUPPORTED

  Resource not supported

• 4070

  ERR_RESOURCE_DUPLICATED

  Duplicate resource

• 4071

  ERR_INDICATOR_CANNOT_INIT

  Custom indicator cannot initialize

• 4072

  ERR_INDICATOR_CANNOT_LOAD

  Cannot load custom indicator

• 4073

  ERR_NO_HISTORY_DATA

  No history data

• 4074

  ERR_NO_MEMORY_FOR_HISTORY

  No memory for history data

• 4075

  ERR_NO_MEMORY_FOR_INDICATOR

  Not enough memory for indicator calculation

• 4099

  ERR_END_OF_FILE

  End of file

• 4100

  ERR_SOME_FILE_ERROR

  Some file error

• 4101

  ERR_WRONG_FILE_NAME

  Wrong file name

• 4102

  ERR_TOO_MANY_OPENED_FILES

  Too many opened files

• 4103

  ERR_CANNOT_OPEN_FILE

  Cannot open file

• 4104

  ERR_INCOMPATIBLE_FILEACCESS

  Incompatible access to a file

• 4105

  ERR_NO_ORDER_SELECTED

  No order selected

• 4106

  ERR_UNKNOWN_SYMBOL

  Unknown symbol

• 4107

  ERR_INVALID_PRICE_PARAM

  Invalid price

  Cause and fix

• 4108

  ERR_INVALID_TICKET

  Invalid ticket

• 4109

  ERR_TRADE_NOT_ALLOWED

  Trade is not allowed. Enable checkbox "Allow live trading" in the Expert Advisor properties

• 4110

  ERR_LONGS_NOT_ALLOWED

  Longs are not allowed. Check the Expert Advisor properties

• 4111

  ERR_SHORTS_NOT_ALLOWED

  Shorts are not allowed. Check the Expert Advisor properties

  Cause and fix

• 4112

  ERR_TRADE_EXPERT_DISABLED_BY_SERVER

  Automated trading by Expert Advisors/Scripts disabled by trade server

  Cause and fix

• 4200

  ERR_OBJECT_ALREADY_EXISTS

  Object already exists

  Cause and fix

• 4201

  ERR_UNKNOWN_OBJECT_PROPERTY

  Unknown object property

• 4202

  ERR_OBJECT_DOES_NOT_EXIST

  Object does not exist

• 4203

  ERR_UNKNOWN_OBJECT_TYPE

  Unknown object type

• 4204

  ERR_NO_OBJECT_NAME

  No object name

• 4205

  ERR_OBJECT_COORDINATES_ERROR

  Object coordinates error

• 4206

  ERR_NO_SPECIFIED_SUBWINDOW

  No specified subwindow

• 4207

  ERR_SOME_OBJECT_ERROR

  Graphical object error

• 4210

  ERR_CHART_PROP_INVALID

  Unknown chart property

• 4211

  ERR_CHART_NOT_FOUND

  Chart not found

• 4212

  ERR_CHARTWINDOW_NOT_FOUND

  Chart subwindow not found

• 4213

  ERR_CHARTINDICATOR_NOT_FOUND

  Chart indicator not found

• 4220

  ERR_SYMBOL_SELECT

  Symbol select error

• 4250

  ERR_NOTIFICATION_ERROR

  Notification error

• 4251

  ERR_NOTIFICATION_PARAMETER

  Notification parameter error

• 4252

  ERR_NOTIFICATION_SETTINGS

  Notifications disabled

• 4253

  ERR_NOTIFICATION_TOO_FREQUENT

  Notification send too frequent

• 4260

  ERR_FTP_NOSERVER

  FTP server is not specified

• 4261

  ERR_FTP_NOLOGIN

  FTP login is not specified

• 4262

  ERR_FTP_CONNECT_FAILED

  FTP connection failed

• 4263

  ERR_FTP_CLOSED

  FTP connection closed

• 4264

  ERR_FTP_CHANGEDIR

  FTP path not found on server

• 4265

  ERR_FTP_FILE_ERROR

  File not found in the MQL4\Files directory to send on FTP server

• 4266

  ERR_FTP_ERROR

  Common error during FTP data transmission

• 5001

  ERR_FILE_TOO_MANY_OPENED

  Too many opened files

• 5002

  ERR_FILE_WRONG_FILENAME

  Wrong file name

• 5003

  ERR_FILE_TOO_LONG_FILENAME

  Too long file name

• 5004

  ERR_FILE_CANNOT_OPEN

  Cannot open file

  Cause and fix

• 5005

  ERR_FILE_BUFFER_ALLOCATION_ERROR

  Text file buffer allocation error

• 5006

  ERR_FILE_CANNOT_DELETE

  Cannot delete file

• 5007

  ERR_FILE_INVALID_HANDLE

  Invalid file handle (file closed or was not opened)

• 5008

  ERR_FILE_WRONG_HANDLE

  Wrong file handle (handle index is out of handle table)

• 5009

  ERR_FILE_NOT_TOWRITE

  File must be opened with FILE_WRITE flag

• 5010

  ERR_FILE_NOT_TOREAD

  File must be opened with FILE_READ flag

• 5011

  ERR_FILE_NOT_BIN

  File must be opened with FILE_BIN flag

• 5012

  ERR_FILE_NOT_TXT

  File must be opened with FILE_TXT flag

• 5013

  ERR_FILE_NOT_TXTORCSV

  File must be opened with FILE_TXT or FILE_CSV flag

• 5014

  ERR_FILE_NOT_CSV

  File must be opened with FILE_CSV flag

• 5015

  ERR_FILE_READ_ERROR

  File read error

• 5016

  ERR_FILE_WRITE_ERROR

  File write error

• 5017

  ERR_FILE_BIN_STRINGSIZE

  String size must be specified for binary file

• 5018

  ERR_FILE_INCOMPATIBLE

  Incompatible file (for string arrays-TXT, for others-BIN)

• 5019

  ERR_FILE_IS_DIRECTORY

  File is directory not file

• 5020

  ERR_FILE_NOT_EXIST

  File does not exist

• 5021

  ERR_FILE_CANNOT_REWRITE

  File cannot be rewritten

• 5022

  ERR_FILE_WRONG_DIRECTORYNAME

  Wrong directory name

• 5023

  ERR_FILE_DIRECTORY_NOT_EXIST

  Directory does not exist

• 5024

  ERR_FILE_NOT_DIRECTORY

  Specified file is not directory

• 5025

  ERR_FILE_CANNOT_DELETE_DIRECTORY

  Cannot delete directory

• 5026

  ERR_FILE_CANNOT_CLEAN_DIRECTORY

  Cannot clean directory

• 5027

  ERR_FILE_ARRAYRESIZE_ERROR

  Array resize error

• 5028

  ERR_FILE_STRINGRESIZE_ERROR

  String resize error

• 5029

  ERR_FILE_STRUCT_WITH_OBJECTS

  Structure contains strings or dynamic arrays

• 5200

  ERR_WEBREQUEST_INVALID_ADDRESS

  Invalid URL

• 5201

  ERR_WEBREQUEST_CONNECT_FAILED

  Failed to connect to specified URL

• 5202

  ERR_WEBREQUEST_TIMEOUT

  Timeout exceeded

• 5203

  ERR_WEBREQUEST_REQUEST_FAILED

  HTTP request failed

• 65536

  ERR_USER_ERROR_FIRST

  User defined errors start with this code