MT4 error messages and descriptions

There are 2 files for which you have access in your MT4 platform which are related to error messages. The 2 files are located here:

1. C:\Program files\Your_MT4_Directory\Experts\Include\stderror.mqh
2. C:\Program files\Your_MT4_Directory\Experts\Librairies\stdlib.mq4

First, you’ve got a list of codes returned from the trade server, followed by MQL4 errors. You can see the number of the error and the code description – see below:

//+------------------------------------------------------------------+
// return error description
//+------------------------------------------------------------------+

//---- codes returned from trade server
case 0:
case 1: error_string="no error";
case 2: error_string="common error";
case 3: error_string="invalid trade parameters";
case 4: error_string="trade server is busy";
case 5: error_string="old version of the client terminal";
case 6: error_string="no connection with trade server";
case 7: error_string="not enough rights";
case 8: error_string="too frequent requests";
case 9: error_string="malfunctional trade operation (never returned error)";
case 64: error_string="account disabled";
case 65: error_string="invalid account";
case 128: error_string="trade timeout";
case 129: error_string="invalid price";
case 130: error_string="invalid stops";
case 131: error_string="invalid trade volume";
case 132: error_string="market is closed";
case 133: error_string="trade is disabled";
case 134: error_string="not enough money";
case 135: error_string="price changed";
case 136: error_string="off quotes";
case 137: error_string="broker is busy (never returned error)";
case 138: error_string="requote";
case 139: error_string="order is locked";
case 140: error_string="long positions only allowed";
case 141: error_string="too many requests";
case 145: error_string="modification denied because order too close to market";
case 146: error_string="trade context is busy";
case 147: error_string="expirations are denied by broker";
case 148: error_string="amount of open and pending orders has reached the limit";


//---- mql4 errors

case 4000: error_string="no error (never generated code)";
case 4001: error_string="wrong function pointer";
case 4002: error_string="array index is out of range";
case 4003: error_string="no memory for function call stack";
case 4004: error_string="recursive stack overflow";
case 4005: error_string="not enough stack for parameter";
case 4006: error_string="no memory for parameter string";
case 4007: error_string="no memory for temp string";
case 4008: error_string="not initialized string";
case 4009: error_string="not initialized string in array";
case 4010: error_string="no memory for array\' string";
case 4011: error_string="too long string";
case 4012: error_string="remainder from zero divide";
case 4013: error_string="zero divide";
case 4014: error_string="unknown command";
case 4015: error_string="wrong jump (never generated error)";
case 4016: error_string="not initialized array";
case 4017: error_string="dll calls are not allowed";
case 4018: error_string="cannot load library";
case 4019: error_string="cannot call function";
case 4020: error_string="expert function calls are not allowed";
case 4021: error_string="not enough memory for temp string returned from function";
case 4022: error_string="system is busy (never generated error)";
case 4050: error_string="invalid function parameters count";
case 4051: error_string="invalid function parameter value";
case 4052: error_string="string function internal error";
case 4053: error_string="some array error";
case 4054: error_string="incorrect series array using";
case 4055: error_string="custom indicator error";
case 4056: error_string="arrays are incompatible";
case 4057: error_string="global variables processing error";
case 4058: error_string="global variable not found";
case 4059: error_string="function is not allowed in testing mode";
case 4060: error_string="function is not confirmed";
case 4061: error_string="send mail error";
case 4062: error_string="string parameter expected";
case 4063: error_string="integer parameter expected";
case 4064: error_string="double parameter expected";
case 4065: error_string="array as parameter expected";
case 4066: error_string="requested history data in update state";
case 4099: error_string="end of file";
case 4100: error_string="some file error";
case 4101: error_string="wrong file name";
case 4102: error_string="too many opened files";
case 4103: error_string="cannot open file";
case 4104: error_string="incompatible access to a file";
case 4105: error_string="no order selected";
case 4106: error_string="unknown symbol";
case 4107: error_string="invalid price parameter for trade function";
case 4108: error_string="invalid ticket";
case 4109: error_string="trade is not allowed in the expert properties";
case 4110: error_string="longs are not allowed in the expert properties";
case 4111: error_string="shorts are not allowed in the expert properties";
case 4200: error_string="object is already exist";
case 4201: error_string="unknown object property";
case 4202: error_string="object is not exist";
case 4203: error_string="unknown object type";
case 4204: error_string="no object name";
case 4205: error_string="object coordinates error";
case 4206: error_string="no specified subwindow";
default: error_string="unknown error";