Trying to make a cave with Visibility Brush

[Cqmics]

I’m trying to put a tunnel through landscape but it won’t let me use the Visibility brush: it keeps saying
Note: There are some areas where visibility painting is disabled because Component/Proxy don’t have a “Landscape Visibility Mask” node in their material.

Can someone please help me out here, I’m a big noob when it comes to this and all the fixes i found don’t make sense to me as a new player

[Hardcawcanary]

Hey Cqmics,

Not sure, but is that dirt layer your using to soften the rock face, is it the one without a mask node ?

Maybe it only works if its got any paint layer other than grass on it. If so repaint the dirt around the hole after you paint the visibility.