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MT4 / MT5 Error Codes & Trading Tools
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Official error code lookup
1171 matching records
| Platform / category | Code / constant | Official meaning | Troubleshooting |
|---|---|---|---|
| MT4 · Compilation errors | 278 | Overriding the default parameter (different values in declaration and implementation) | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 279 | Not allowed to call non-constant method for a constant object | YI GOLD suggestionsVerify chart ID, object existence and property types. Check creation/update results and avoid name collisions. MetaQuotes |
| MT4 · Compilation errors | 280 | An object is necessary for accessing members (a dot for a non class/structure is set) | YI GOLD suggestionsVerify chart ID, object existence and property types. Check creation/update results and avoid name collisions. MetaQuotes |
| MT4 · Compilation errors | 281 | The name of an already declared structure cannot be used in declaration | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 284 | Unauthorized conversion (at closed inheritance) | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 285 | Structures and arrays cannot be used as input variables | YI GOLD suggestionsCheck length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access. MetaQuotes |
| MT4 · Compilation errors | 286 | Const specifier is not valid for constructor/destructor | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 287 | Incorrect string expression for a datetime | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 288 | Unknown property (#property) | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 289 | Incorrect value of a property | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 290 | Invalid index for a property in #property | YI GOLD suggestionsCheck length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access. MetaQuotes |
| MT4 · Compilation errors | 291 | Call parameter omitted - <func (x,)> | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 293 | Object must be passed by reference | YI GOLD suggestionsVerify chart ID, object existence and property types. Check creation/update results and avoid name collisions. MetaQuotes |
| MT4 · Compilation errors | 294 | Array must be passed by reference | YI GOLD suggestionsCheck length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access. MetaQuotes |
| MT4 · Compilation errors | 295 | Function was declared as exportable | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 296 | Function was not declared as exportable | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 297 | It is prohibited to export imported function | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 298 | Imported function cannot have this parameter (prohibited to pass a pointer, class or structure containing a dynamic array, pointer, class, etc.) | YI GOLD suggestionsCheck length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access. MetaQuotes |
| MT4 · Compilation errors | 299 | Must be a class | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 300 | #import was not closed | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 302 | Type mismatch | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 303 | Extern variable is already initialized | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 304 | No exported function or entry point found | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 305 | Explicit constructor call is not allowed | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 306 | Method was declared as constant | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 307 | Method was not declared as constant | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 308 | Incorrect size of the resource file | YI GOLD suggestionsCheck permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access. MetaQuotes |
| MT4 · Compilation errors | 309 | Incorrect resource name | YI GOLD suggestionsCheck permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access. MetaQuotes |
| MT4 · Compilation errors | 310 | Resource file opening error | YI GOLD suggestionsCheck permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access. MetaQuotes |
| MT4 · Compilation errors | 311 | Resource file reading error | YI GOLD suggestionsCheck permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access. MetaQuotes |
| MT4 · Compilation errors | 312 | Unknown resource type | YI GOLD suggestionsCheck permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access. MetaQuotes |
| MT4 · Compilation errors | 313 | Incorrect path to the resource file | YI GOLD suggestionsCheck permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access. MetaQuotes |
| MT4 · Compilation errors | 314 | The specified resource name is already used | YI GOLD suggestionsCheck permitted terminal sandbox paths, names, access flags, formats and handles. Record open failures without granting permissive directory access. MetaQuotes |
| MT4 · Compilation errors | 315 | Argument expected for the function-like macro | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 316 | Unexpected symbol in macro definition | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 317 | Error in formal parameters of the macro | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 318 | Invalid number of parameters for a macro | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 319 | Too many parameters for a macro | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 320 | Too complex, simplify the macro | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 321 | Parameter for EnumToString() can be only an enumeration | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
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