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MT4 / MT5 Error Codes & Trading Tools
Search official trade, runtime and compilation codes and warnings. Calculate risk using actual contract specifications.
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Official error code lookup
1171 matching records
| Platform / category | Code / constant | Official meaning | Troubleshooting |
|---|---|---|---|
| MT4 · Compilation errors | 185 | Inappropriate use of ellipsis | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 186 | The initializing sequence has more elements than the initialized variable | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 187 | A constant for case expected | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 188 | A constant expression required | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 189 | A constant variable cannot be changed | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 190 | Closing bracket or a comma is expected (declaring array member) | YI GOLD suggestionsCheck length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access. MetaQuotes |
| MT4 · Compilation errors | 191 | Enumerator identifier already defined | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 192 | Enumeration cannot have access modifiers (const, extern, static) | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 193 | Enumeration member already declared with a different value | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 194 | There is a variable defined with the same name | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 195 | There is a structure defined with the same name | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 196 | Name of enumeration member expected | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 197 | Integer expression expected | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 198 | Division by zero in constant expression | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 199 | Wrong number of parameters in the function | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 200 | Parameter by reference must be a variable | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 201 | Variable of the same type to pass by reference expected | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 202 | A constant variable cannot be passed by a non-constant reference | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 203 | Requires a positive integer 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 | 204 | Failed to access protected class member | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 205 | Import already defined in another way | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 208 | Executable file not created | 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 | 209 | 'OnCalculate' entry point not found for the indicator | YI GOLD suggestionsVerify symbol, timeframe, indicator handle, BarsCalculated and copied element counts. Wait for data availability rather than filling missing prices with zeros. MetaQuotes |
| MT4 · Compilation errors | 210 | The continue operation can be used only inside a loop | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 211 | Error accessing private (closed) class member | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 213 | Method of structure or class is not declared | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 214 | Error accessing private (closed) class method | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 216 | Copying of structures with objects is not allowed | YI GOLD suggestionsVerify chart ID, object existence and property types. Check creation/update results and avoid name collisions. MetaQuotes |
| MT4 · Compilation errors | 218 | Index out of array range | YI GOLD suggestionsCheck length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access. MetaQuotes |
| MT4 · Compilation errors | 219 | Array initialization in structure or class declaration not allowed | YI GOLD suggestionsCheck length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access. MetaQuotes |
| MT4 · Compilation errors | 220 | Class constructor cannot have parameters | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 221 | Class destructor can not have parameters | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 222 | Class method or structure with the same name and parameters have already been declared | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 223 | Operand expected | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 224 | Class method or structure with the same name exists, but with different parameters (declaration!=implementation) | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 225 | Imported function is not described | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 226 | ZeroMemory() is not allowed for objects with protected members or inheritance | YI GOLD suggestionsReduce recursion and large local arrays, review allocation/release, batch history processing and check memory-operation results. MetaQuotes |
| MT4 · Compilation errors | 227 | Ambiguous call of the overloaded function (exact match of parameters for several overloads) | YI GOLD suggestionsCompare each argument and reference mode with the official signature. Validate ranges and preserve relevant failure context. MetaQuotes |
| MT4 · Compilation errors | 228 | Variable name expected | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
| MT4 · Compilation errors | 229 | A reference cannot be declared in this place | YI GOLD suggestionsLocate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile. MetaQuotes |
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