MQL4 Reference 
Constants, Enumerations and Structures Codes of Errors and Warnings Trade Server Return Codes
Trade Server Return Codes
GetLastError() - returns error codes. Error codes are defined in stderror.mqh. To print the error description you can use the ErrorDescription() function, defined in stdlib.mqh.
Example:
#include <stderror.mqh>
#include <stdlib.mqh>
void SendMyMessage(string text)
{
int check;
SendMail("Test", text);
check=GetLastError();
if(check!=ERR_NO_ERROR) Print("Message not sent. Error: ",ErrorDescription(check));
} |
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0
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ERR_NO_ERROR
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No error returned
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1
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ERR_NO_RESULT
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No error returned, but the result is unknown
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2
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ERR_COMMON_ERROR
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Common error
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3
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ERR_INVALID_TRADE_PARAMETERS
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Invalid trade parameters
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4
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ERR_SERVER_BUSY
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Trade server is busy
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5
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ERR_OLD_VERSION
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Old version of the client terminal
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6
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ERR_NO_CONNECTION
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No connection with trade server
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7
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ERR_NOT_ENOUGH_RIGHTS
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Not enough rights
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8
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ERR_TOO_FREQUENT_REQUESTS
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Too frequent requests
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9
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ERR_MALFUNCTIONAL_TRADE
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Malfunctional trade operation
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64
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ERR_ACCOUNT_DISABLED
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Account disabled
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65
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ERR_INVALID_ACCOUNT
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Invalid account
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128
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ERR_TRADE_TIMEOUT
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Trade timeout
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129
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ERR_INVALID_PRICE
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Invalid price
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130
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ERR_INVALID_STOPS
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Invalid stops
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131
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ERR_INVALID_TRADE_VOLUME
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Invalid trade volume
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132
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ERR_MARKET_CLOSED
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Market is closed
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133
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ERR_TRADE_DISABLED
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Trade is disabled
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134
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ERR_NOT_ENOUGH_MONEY
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Not enough money
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135
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ERR_PRICE_CHANGED
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Price changed
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136
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ERR_OFF_QUOTES
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Off quotes
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137
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ERR_BROKER_BUSY
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Broker is busy
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138
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ERR_REQUOTE
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Requote
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139
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ERR_ORDER_LOCKED
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Order is locked
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140
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ERR_LONG_POSITIONS_ONLY_ALLOWED
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Buy orders only allowed
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141
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ERR_TOO_MANY_REQUESTS
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Too many requests
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145
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ERR_TRADE_MODIFY_DENIED
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Modification denied because order is too close to market
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146
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ERR_TRADE_CONTEXT_BUSY
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Trade context is busy
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147
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ERR_TRADE_EXPIRATION_DENIED
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Expirations are denied by broker
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148
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ERR_TRADE_TOO_MANY_ORDERS
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The amount of open and pending orders has reached the limit set by the broker
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149
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ERR_TRADE_HEDGE_PROHIBITED
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An attempt to open an order opposite to the existing one when hedging is disabled
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150
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ERR_TRADE_PROHIBITED_BY_FIFO
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An attempt to close an order contravening the FIFO rule
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