Error: Use of incomplete type

Development Programming & Scripting C++
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1

USTRUCT(BlueprintType)
struct FFoo
{
UPROPERTY(EditAnywhere, BlueprintReadWrite)
int32 X;

	static constexpr FFoo Invalid = FFoo(INT_MIN); // Error: Use of incomplete type.

	Foo(x) : X(x){}
}


FFoo MyVar = FFoo::Invalid;

This error makes sense. But how do I fix it?