The error associated with the highlighted node is at the bottom: “Magma expected a InputGeometry node: | ID: 12 | InputIndex: 1 | Connected to ID: 14”.
This particular error is saying it wanted an InputGeometry node which is different from an InputObject node. I think its slightly confusing, but InputGeometry is meant to hold references to objects with meshes, while InputObject is for more general scene objects like helpers, cameras, etc. Just change that node to an InputGeometry and you’ll be fine.