What It Means & How to Fix It

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🧠 Why You’re Seeing This Error

C2059 is a generic syntax error — the compiler hit a symbol or keyword (called a token) it didn’t expect. It usually points to:

• A missing semicolon, brace, or parenthesis
• A malformed macro, enum, or function signature
• A stray character from a copy-paste or bad refactor

In UE5, this often appears after a broken USTRUCT, UCLASS, UENUM, or a misused macro like GENERATED_BODY().

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💥 Example Error Message

error C2059: syntax error: ')'

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🛠️ Example Code

USTRUCT()
struct FMyData
{
    GENERATED_BODY()

    int32 Value(100); // ❌ C2059: syntax error
};

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✅ How to Fix C2059 in UE5 – Step-by-Step

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✔️ 1. Check for Incorrect Initializers in Structs

Wrong:

int32 Value(100); // ❌ Looks like a function declaration

Fix:

int32 Value = 100; // ✅ Proper variable initialization

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✔️ 2. Make Sure You Closed All Brackets and Braces

A missing ) or } earlier in your file can trigger this error way later.

Use Ctrl+K, Ctrl+D in Visual Studio to auto-format and spot problems.

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✔️ 3. Watch Out for Macro Errors

If you forget GENERATED_BODY() or mistype USTRUCT(), UE5’s meta system breaks, and you’ll get mysterious C2059s.

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✔️ 4. Avoid Using Commas in Wrong Places (Especially in Enums)

Wrong:

UENUM()
enum class EMyType
{
    OptionA,
    OptionB,
    , // ❌ C2059
};

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✅ Summary: How to Fix C2059 in UE5

Cause	Fix Example
Wrong initializer syntax	Use = instead of () for member variables
Missing semicolon or bracket	Close }, ), or ] properly
Broken macro or metadata	Check for USTRUCT(), GENERATED_BODY(), etc.
Comma or symbol in wrong place	Remove stray characters or incomplete lines