MQL4 ERR_CHART_NOT_FOUND
MQL4 error 4211 chart not found maps to ERR_CHART_NOT_FOUND: chart not found. A chart operation used an identifier that no longer refers to an open chart. Capture GetLastError immediately after the failed call, correct the cause, and retry only when the condition can change.
Open the Coding Agent, then choose MQL4 from the language menu.
#property strict
#property script_show_inputs
input long TargetChartId = 0;
void OnStart()
{
if(TargetChartId < 0)
{
Print("Invalid chart id: ", TargetChartId);
return;
}
ResetLastError();
if(!ChartSetInteger(TargetChartId, CHART_BRING_TO_TOP, true))
Print("ChartSetInteger failed. error=", GetLastError(),
" chart=", TargetChartId);
}The official MQL4 runtime table names error 4211 ERR_CHART_NOT_FOUND and defines it as “chart not found.” A chart operation used an identifier that no longer refers to an open chart.
The error number is evidence about one failed call, not a diagnosis of the whole EA. Read the API sentinel first, then call GetLastError immediately because that function returns the current _LastError value and resets it.
Start with the inputs and external state that existed at the failure point. A later log entry or a successful call can overwrite the useful context.
Retry only after rediscovering or opening a valid target chart. Do not keep using a stale id.
Keep the original trading and risk rules intact. A workaround that widens stops, increases volume, changes an account setting, or ignores a failed return value can hide the symptom while changing the system.
| Check | Action |
|---|---|
| The target chart was closed after its id was cached | Validate the chart id immediately before the operation. |
| A chart id is uninitialized, negative, or confused with a window index | Refresh cached ids when charts open, close, or change. |
| The EA assumes another symbol or timeframe chart is open | Enumerate open charts instead of assuming a target exists. |
| An asynchronous chart change is used before the target exists | Check every chart-operation return value and log the target id. |
The script validates the input and checks ChartSetInteger for the target id. Production code should obtain ids by enumerating currently open charts.
The example improves validation and logging. It does not prove the operation will be accepted by a broker or behave safely in live trading.
#property strict
#property script_show_inputs
input long TargetChartId = 0;
void OnStart()
{
if(TargetChartId < 0)
{
Print("Invalid chart id: ", TargetChartId);
return;
}
ResetLastError();
if(!ChartSetInteger(TargetChartId, CHART_BRING_TO_TOP, true))
Print("ChartSetInteger failed. error=", GetLastError(),
" chart=", TargetChartId);
}Pineify can generate or revise one self-contained .mq4 file with MQL4-specific reference context. Its independent static checker returns MetaEditor diagnostics so you can repair source issues before testing in your own MT4 environment.
Open MQL4 Coding AgentStatic diagnostics do not prove runtime behavior, backtest results, broker compatibility, or live-trading safety.
Check the API return value before interpreting an error number from the log.
Call GetLastError immediately and record error 4211, symbol, prices, volume, ticket, and terminal state relevant to the operation.
Validate the chart id immediately before the operation.
Compile the revised source, then test with the same MT4 build, broker, symbol, account permissions, and market state.
ERR_CHART_NOT_FOUND means chart not found. The code should still identify which API returned failure and log the inputs used for that call.
The target chart was closed after its id was cached A chart id is uninitialized, negative, or confused with a window index The EA assumes another symbol or timeframe chart is open An asynchronous chart change is used before the target exists
Retry only after rediscovering or opening a valid target chart. Do not keep using a stale id.
It reports the current _LastError value and resets it. Other operations can change the error state, so a delayed read may describe the wrong call.
Pineify can revise a self-contained .mq4 file, add validation and error logging, and return static MetaEditor diagnostics. It cannot prove broker acceptance, account permissions, market availability, or live execution.
Last verified against the linked official references on . Compile and test the final source in the MetaTrader 4 build, broker, symbol, and account environment you plan to use.
Define the requirement, inspect the generated source, repair diagnostics, and test the behavior in your own MT4 environment.
Open Coding Agent