Cinemachine Orbital Follow with click&drag throws errors

I am using a Cinemachine camera with Orbital Follow that is controlled by the default Input Axis Controller.
I wanted to control the camera by a click and drag motion. I am using Input System, so I created a new action that has a One modifier binding (left mouse click is the modifier, mouse delta is the binding, see picture)
image

Now, this actually works. When I try to control the camera by clicking and dragging, it does what I expect. But what worries me is that sometimes, an error pops up in the console:

I just want to find out if this is a bug (because the thing actually works, it just throws errors), or if there is something I am doing wrong.

It’s saying that your action is not a Vector2 type. Change it to a Vector2 type, or make a custom reader.