target = transform.GetComponent<Camera>().ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, transform.position.z));
crosshairs.transform.position = new Vector2(target.x, target.y);
Vector2 difference = target - player.transform.position;
float rotationZ = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;
player.transform.rotation = Quaternion.Euler(0.0f, 0.0f, rotationZ);
Operator '-' is ambiguous on operands of type 'Vector2' and 'Vector3'
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1 Answers
The error message is quite clear.
There are implicit (automatic) conversions Vector3 -> Vector2 and wise versa Vector2 -> Vector3 - meaning you can basically use both types exchangeable.
The operator - however is only defined for either Vector3 - Vector3 or Vector2 - Vector2.
So the compiler simply doesn't understand which one you want to use.
Knowing that Transform.position is a Vector3 I can guess that target is a Vector2.
And since you want to have your result as a Vector2 anyway simply convert explicitly
Vector2 difference = target - (Vector2) player.transform.position;
Sidenote: Just fyi since vectors in Unity are structs you don't need to use new everytime.
Instead of e.g.
crosshairs.transform.position = new Vector2(target.x, target.y);
you can simply do
crosshairs.transform.position = target;
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