WowAce

What steps will reproduce the problem?
1. Open Cartographer 3 Map ("M" key)
2. Right click a player's icon
3. Select "Set waypoint to <player>".

What is the expected output?
You should get a waypoint arrow pointing towards that player.

What do you see instead?
An error.

What version of the product are you using?
v0.10.1

Do you have an error log of what happened?
Message: ...terface\AddOns\Cartographer3_Waypoints\Waypoints.lua line 99:
   Usage: UnitName("unit")
Debug:
   [C]: ?
   [C]: UnitName()
   ...terface\AddOns\Cartographer3_Waypoints\Waypoints.lua:99: func()
   ..\FrameXML\UIDropDownMenu.lua:568: UIDropDownMenuButton_OnClick()
   [string "*:OnClick"]:1:
      [string "*:OnClick"]:1