I've got a Layout file, which moves the inventory panel slightly to the left, it does work, but it gives me this error whenever the map starts:
UI: File [MoveInventory.SC2Layout] Line  Column . Attempting to add a desc named [MoveInventory] to  with the same name as an already existing child.
Why does this happen, and how can I make it stop?
This is my SC2Layout:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Frame type="InventoryPanel" name="GameUI/UIContainer/ConsoleUIContainer/InventoryPanel" file="GameUI">
<Frame type="InventoryContainer" name="InventoryButtons">
<Anchor side="Bottom" relative="$parent" pos="Max" offset="-270"/>
<Anchor side="Right" relative="$parent" pos="Max" offset="-240"/>
most likely your layout file is added 2 times. it's a bug that sometimes occours. make a backup of your map, save it as components, go to the UI folder, delete the bugged one.
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I removed the Desc files in the UI folder, and it removed the error.