### Basic question about annihilator

I want to compute the intersection of a plane r spanned by two vectors and another plane s defined by its implicit equation.
I thought the following would work:

```
var('x0,x1,x2')
r0 = vector(QQ,[3,1,-2])
r1 = vector(QQ,[1,-5,3])
r = span([r0,r1])
s = 2*x0 - 3*x1 - 4*x2 == 0
r.annihilator([vector([2,-3,-4])])
```

But instead I am greeted with an error message saying that `AttributeError: 'sage.rings.rational.Rational' object has no attribute '_vector_'`

.

What am I doing ~~wrong? ~~wrong?