MQL4 error diagnosis
Searches for MQL4 internal error 112 mix two error tables. In the official MQL4 compilation table, code 112 means a double quotation mark was omitted. The official runtime table assigns internal error to code 4024. Check whether the message came from MetaEditor compilation or GetLastError before applying a fix.
#property strict
void OnStart()
{
string message = "The closing double quote is present.";
Print(message);
}MetaEditor compilation error 112 identifies an omitted double quotation mark. Inspect the first reported line and the string immediately before it because an unterminated literal can shift later diagnostics away from the true source.
Also check quotes inside formatted messages, file paths, object names, and copied text. Replace typographic quotation marks with plain code quotes when content came from a document editor.
The MQL4 runtime error table names 4024 ERR_INTERNAL_ERROR. If the number came from GetLastError, verify the captured value and failed API instead of using the compiler meaning for 112.
One missing quote can make valid identifiers, parentheses, and lines look wrong to the compiler. Compile again after the first repair and reassess the remaining messages instead of editing every highlighted line at once.
The string literal has both opening and closing double quotation marks. A missing quote can cause later tokens and lines to be parsed incorrectly, so repair the first diagnostic before reviewing secondary messages.
A corrected string literal can clear compiler diagnostics but does not validate the surrounding calculation, order behavior, or runtime environment.
#property strict
void OnStart()
{
string message = "The closing double quote is present.";
Print(message);
}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 whether 112 appears in MetaEditor output or in a runtime log from GetLastError.
Look backward for a string with a missing or typographic double quote.
Close the literal and compile again before changing secondary lines.
If the issue is runtime internal error, preserve the failed API, arguments, build, and timestamp.
The official compilation table defines error 112 as an omitted double quotation mark.
The official runtime table does not define internal error as 112. It assigns ERR_INTERNAL_ERROR to code 4024.
The compiler can parse later source as part of the unfinished string, which creates secondary diagnostics.
Yes. Code should use plain ASCII double quotation marks, not typographic opening and closing quote characters.
Pineify can revise a self-contained .mq4 file and run an independent MetaEditor syntax check. Runtime behavior still needs testing in MT4.
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