Can't trim surface because "trim tool and target do not intersect"

See attached screenshot: https://i.imgur.com/d82fyye.png

I have a knitted surface as trim tool and a plane to trim. I can select what to trim just fine, however it won't do the trim because of what's in the title. Funny enought, all the surfaces of the knitted trim tool were previously trimmed with said plane, so they do intersect. How could I trim the plane?

SolidworksAssemblies