ERROR: No .oso file could be found for shader "foo"
ERROR: Could not find shader "foo"
        group: unnamed_group_1
ERROR: No .oso file could be found for shader "bar"
ERROR: Could not find shader "bar"
        group: unnamed_group_1
Connect lay1.x to lay2.y
ERROR: ConnectShaders: source layer "lay1" not found
        group: unnamed_group_1
