What It Means & How to Fix It

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🧠 Why You’re Seeing This Error

The C2146 error means the compiler expected a semicolon (;) or another symbol, but instead it ran into an identifier (like a variable or function name). This usually means you’ve missed a type, a semicolon, or something else in the declaration above it.

In UE5, this is one of the most common syntax errors — it happens when:

• You declare a variable without a type
• You forget to include the header for a class or struct
• You mistype UPROPERTY() or UCLASS() macros
• You miss a semicolon after a struct or class definition

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💥 Example Error Message

error C2146: syntax error: missing ';' before identifier 'Health'

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🛠️ Example Code

UPROPERTY()
Health; // ❌ C2146: Missing type before identifier

The compiler sees Health and doesn’t know what it is — because we never told it the type.

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✅ How to Fix C2146 in UE5 – Step-by-Step

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✔️ 1. Always Provide a Type Before the Identifier

Fix:

UPROPERTY()
int32 Health; // ✅ Type is now declared

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✔️ 2. Make Sure You Included the Right Headers

If you’re using a custom class or struct type, and didn’t #include the header, the compiler will fail to recognize the type.

Wrong:

UPROPERTY()
FMyStruct MyData; // ❌ FMyStruct not defined yet

Fix:

#include "MyStruct.h" // ✅ Include the type

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✔️ 3. Check for Missing Semicolons After Struct or Class Declarations

Wrong:

USTRUCT()
struct FMyData
{
    int32 Score;
} // ❌ Missing semicolon here

Fix:

} // ✅
;

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✔️ 4. Macro Issues Can Also Trigger This

If UCLASS() or GENERATED_BODY() is broken or missing, the compiler might get confused and throw unrelated syntax errors below it.

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✅ Summary: How to Fix C2146 in UE5

Cause	Fix Example
Variable declared without a type	Add the type (e.g., int32 Health;)
Custom type not included	#include the header file that defines the type
Missing semicolon after struct/class	Always end with ; after closing brace
Broken Unreal macros	Check UCLASS(), GENERATED_BODY(), etc.