MetaTrader 4 Error Codes & What They Mean

Here’s a neat list of all the possible error codes you may encounter on the MT4 platform together with a brief description of the error itself. The list contains the default error messages you may encounter while trading your EAs and a list of MQL run time error codes for programmers that use the MQL4 language. This is a useful list that could come in handy the next time you’re in a fix so be sure to bookmark this link…

The GetLastError() function returns the last error code. The Error code constants are defined in the stderror.mqh file.

To print text messages use the ErrorDescription() function defined in the stdlib.mqh file.

The following table lists the Error codes returned from the trade server.

Constant

 

Value

 

Description

 

ERR_NO_ERROR

 

0

 

No
error returned.

 

ERR_NO_RESULT

 

1

 

No
error returned, but the result is unknown.

 

ERR_COMMON_ERROR

 

2

 

Common
error.

 

ERR_INVALID_TRADE_PARAMETERS

 

3

 

Invalid
trade parameters.

 

ERR_SERVER_BUSY

 

4

 

Trade
server is busy.

 

ERR_OLD_VERSION

 

5

 

Old
version of the client terminal.

 

ERR_NO_CONNECTION

 

6

 

No
connection with trade server.

 

ERR_NOT_ENOUGH_RIGHTS

 

7

 

Not
enough rights.

 

ERR_TOO_FREQUENT_REQUESTS

 

8

 

Too
frequent requests.

 

ERR_MALFUNCTIONAL_TRADE

 

9

 

Malfunctional
trade operation.

 

ERR_ACCOUNT_DISABLED

 

64

 

Account
disabled.

 

ERR_INVALID_ACCOUNT

 

65

 

Invalid
account.

 

ERR_TRADE_TIMEOUT

 

128

 

Trade
timeout.

 

ERR_INVALID_PRICE

 

129

 

Invalid
price.

 

ERR_INVALID_STOPS

 

130

 

Invalid
stops.

 

ERR_INVALID_TRADE_VOLUME

 

131

 

Invalid
trade volume.

 

ERR_MARKET_CLOSED

 

132

 

Market
is closed.

 

ERR_TRADE_DISABLED

 

133

 

Trade
is disabled.

 

ERR_NOT_ENOUGH_MONEY

 

134

 

Not
enough money.

 

ERR_PRICE_CHANGED

 

135

 

Price
changed.

 

ERR_OFF_QUOTES

 

136

 

Off
quotes.

 

ERR_BROKER_BUSY

 

137

 

Broker
is busy.

 

ERR_REQUOTE

 

138

 

Requote.

 

ERR_ORDER_LOCKED

 

139

 

Order
is locked.

 

ERR_LONG_POSITIONS_ONLY_ALLOWED

 

140

 

Long
positions only allowed.

 

ERR_TOO_MANY_REQUESTS

 

141

 

Too
many requests.

 

ERR_TRADE_MODIFY_DENIED

 

145

 

Modification
denied because order too close to market.

 

ERR_TRADE_CONTEXT_BUSY

 

146

 

Trade
context is busy.

 

Here are the MQL4 run time error codes:

Constant

 

Value

 

Description

 

ERR_NO_MQLERROR

 

4000

 

No
error.

 

ERR_WRONG_FUNCTION_POINTER

 

4001

 

Wrong
function pointer.

 

ERR_ARRAY_INDEX_OUT_OF_RANGE

 

4002

 

Array
index is out of range.

 

ERR_NO_MEMORY_FOR_FUNCTION_CALL_STACK

 

4003

 

No
memory for function call stack.

 

ERR_RECURSIVE_STACK_OVERFLOW

 

4004

 

Recursive
stack overflow.

 

ERR_NOT_ENOUGH_STACK_FOR_PARAMETER

 

4005

 

Not
enough stack for parameter.

 

ERR_NO_MEMORY_FOR_PARAMETER_STRING

 

4006

 

No
memory for parameter string.

 

ERR_NO_MEMORY_FOR_TEMP_STRING

 

4007

 

No
memory for temp string.

 

ERR_NOT_INITIALIZED_STRING

 

4008

 

Not
initialized string.

 

ERR_NOT_INITIALIZED_ARRAYSTRING

 

4009

 

Not
initialized string in array.

 

ERR_NO_MEMORY_FOR_ARRAYSTRING

 

4010

 

No
memory for array string.

 

ERR_TOO_LONG_STRING

 

4011

 

Too
long string.

 

ERR_REMAINDER_FROM_ZERO_DIVIDE

 

4012

 

Remainder
from zero divide.

 

ERR_ZERO_DIVIDE

 

4013

 

Zero
divide.

 

ERR_UNKNOWN_COMMAND

 

4014

 

Unknown
command.

 

ERR_WRONG_JUMP

 

4015

 

Wrong
jump (never generated error).

 

ERR_NOT_INITIALIZED_ARRAY

 

4016

 

Not
initialized array.

 

ERR_DLL_CALLS_NOT_ALLOWED

 

4017

 

DLL
calls are not allowed.

 

ERR_CANNOT_LOAD_LIBRARY

 

4018

 

Cannot
load library.

 

ERR_CANNOT_CALL_FUNCTION

 

4019

 

Cannot
call function.

 

ERR_EXTERNAL_EXPERT_CALLS_NOT_ALLOWED

 

4020

 

Expert
function calls are not allowed.

 

ERR_NOT_ENOUGH_MEMORY_FOR_RETURNED_STRING

 

4021

 

Not
enough memory for temp string returned from function.

 

ERR_SYSTEM_BUSY

 

4022

 

System
is busy (never generated error).

 

ERR_INVALID_FUNCTION_PARAMETERS_COUNT

 

4050

 

Invalid
function parameters count.

 

ERR_INVALID_FUNCTION_PARAMETER_VALUE

 

4051

 

Invalid
function parameter value.

 

ERR_STRING_FUNCTION_INTERNAL_ERROR

 

4052

 

String
function internal error.

 

ERR_SOME_ARRAY_ERROR

 

4053

 

Some
array error.

 

ERR_INCORRECT_SERIES_ARRAY_USING

 

4054

 

Incorrect
series array using.

 

ERR_CUSTOM_INDICATOR_ERROR

 

4055

 

Custom
indicator error.

 

ERR_INCOMPATIBLE_ARRAYS

 

4056

 

Arrays
are incompatible.

 

ERR_GLOBAL_VARIABLES_PROCESSING_ERROR

 

4057

 

Global
variables processing error.

 

ERR_GLOBAL_VARIABLE_NOT_FOUND

 

4058

 

Global
variable not found.

 

ERR_FUNCTION_NOT_ALLOWED_IN_TESTING_MODE

 

4059

 

Function
is not allowed in testing mode.

 

ERR_FUNCTION_NOT_CONFIRMED

 

4060

 

Function
is not confirmed.

 

ERR_SEND_MAIL_ERROR

 

4061

 

Send
mail error.

 

ERR_STRING_PARAMETER_EXPECTED

 

4062

 

String
parameter expected.

 

ERR_INTEGER_PARAMETER_EXPECTED

 

4063

 

Integer
parameter expected.

 

ERR_DOUBLE_PARAMETER_EXPECTED

 

4064

 

Double
parameter expected.

 

ERR_ARRAY_AS_PARAMETER_EXPECTED

 

4065

 

Array
as parameter expected.

 

ERR_HISTORY_WILL_UPDATED

 

4066

 

Requested
history data in updating state.

 

ERR_END_OF_FILE

 

4099

 

End
of file.

 

ERR_SOME_FILE_ERROR

 

4100

 

Some
file error.

 

ERR_WRONG_FILE_NAME

 

4101

 

Wrong
file name.

 

ERR_TOO_MANY_OPENED_FILES

 

4102

 

Too
many opened files.

 

ERR_CANNOT_OPEN_FILE

 

4103

 

Cannot
open file.

 

ERR_INCOMPATIBLE_ACCESS_TO_FILE

 

4104

 

Incompatible
access to a file.

 

ERR_NO_ORDER_SELECTED

 

4105

 

No
order selected.

 

ERR_UNKNOWN_SYMBOL

 

4106

 

Unknown
symbol.

 

ERR_INVALID_PRICE_PARAM

 

4107

 

Invalid
price.

 

ERR_INVALID_TICKET

 

4108

 

Invalid
ticket.

 

ERR_TRADE_NOT_ALLOWED

 

4109

 

Trade
is not allowed.

 

ERR_LONGS__NOT_ALLOWED

 

4110

 

Longs
are not allowed.

 

ERR_SHORTS_NOT_ALLOWED

 

4111

 

Shorts
are not allowed.

 

ERR_OBJECT_ALREADY_EXISTS

 

4200

 

Object
exists already.

 

ERR_UNKNOWN_OBJECT_PROPERTY

 

4201

 

Unknown
object property.

 

ERR_OBJECT_DOES_NOT_EXIST

 

4202

 

Object
does not exist.

 

ERR_UNKNOWN_OBJECT_TYPE

 

4203

 

Unknown
object type.

 

ERR_NO_OBJECT_NAME

 

4204

 

No
object name.

 

ERR_OBJECT_COORDINATES_ERROR

 

4205

 

Object
coordinates error.

 

ERR_NO_SPECIFIED_SUBWINDOW

 

4206

 

No
specified subwindow.

 

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