error CS0119 What's wrong? (I have old asset maybe it helps you)

void Start ()
Rigidbody2D().angularVelocity = Random.Range(minTumble, maxTumble); movement based on random speed values
Rigidbody2D().velocity = -1 * transform.up * speed;

Whan’s wrong? Error is “Rigidbody2D() —HERE!— .angularVelocity”

The problem is that Rigidbody2D is a class, but you’re trying to use it as a function. Read up on those terms to learn the difference.