» "Warning: Cannot make layer 'screen' a global, a variable with that name already exists"when I code:"Utils.global Layers filename"
Hey there! You'll need to rename whichever layer from your Photoshop/Sketch document conflicts with "screen" (the one named the same). Since Utils.globalLayers flattens the variable name, there is the possibility for variable name conflict.
The best is to avoid naming anything that uses a reserved name.