Right-click a player name in chat in order to get the dropdown menu ("Invite", "Ignore", etc.) and the following errors were thrown up within four seconds of each other. It worked fine in 3.0.3. All other chat mods (Chatter) were turned off after the first errors appeared; the below are the subsequent errors:

GuildGreet-30002.1\\GuildGreet.lua:4241 attempt to index local 'dropdownFrame' (a nil value)\n<in C code>: in function `UnitPopup_HideButtons'\nInterface\\FrameXML\\UnitPopup.lua:180 in function <Interface\\FrameXML\\UnitPopup.lua:161\n<in C code>: in function `UnitPopup_ShowMenu'\nInterface\\FrameXML\\FriendsFrame.lua:89 in function `initFunction':\nInterface\\FrameXML\\UIDropDownMenu.lua:69 in function `UIDropDownMenu_Initialize':\nInterface\\FrameXML\\UIDropDownMenu.lua:713 in function `ToggleDropDownMenu':\nInterface\\FrameXML\\FriendsFrame.lua:84 in function `FriendsFrame_ShowDropdown':\nInterface\\FrameXML\\ItemRef.lua:59 in function <Interface\\FrameXML\\ItemRef.lua:2\nBlizzard_CombatLog\\Blizzard_CombatLog.lua:3570 in function <...ace\\AddOns\\Blizzard_CombatLog\\Blizzard_CombatLog.lua:3514\n<in C code>: ?\n<in C code>: ?\n<in C code>: in function `SetItemRef'\nInterface\\FrameXML\\ChatFrame.lua:2473 in function <Interface\\FrameXML\\ChatFrame.lua:2472\n<in C code>: ?\n<in C code>:", -- [1]
                " ?\n<in C code>: ?\n<in C code>: ?\n<in C code>: ?\n<in C code>: in function `ChatFrame_OnHyperlinkShow'\n<string>:\"*:OnHyperlinkClick\":1: in function <[string \"*:OnHyperlinkClick\"]:1>

GuildGreet-30002.1\\GuildGreet.lua:4241 attempt to index local 'dropdownFrame' (a nil value)\n<in C code>: in function `UnitPopup_HideButtons'\nInterface\\FrameXML\\UnitPopup.lua:180 in function <Interface\\FrameXML\\UnitPopup.lua:161\n<in C code>: in function `UnitPopup_ShowMenu'\nInterface\\FrameXML\\FriendsFrame.lua:89 in function `initFunction':\nInterface\\FrameXML\\UIDropDownMenu.lua:69 in function `UIDropDownMenu_Initialize':\nInterface\\FrameXML\\UIDropDownMenu.lua:713 in function `ToggleDropDownMenu':\n<string>:\"*:OnEnter\":2: in function <[string \"*:OnEnter\"]:1>

GuildGreet-30002.1\\GuildGreet.lua:4224 attempt to index local 'dropdownFrame' (a nil value)\n<in C code>: in function `func'\nInterface\\FrameXML\\UIDropDownMenu.lua:561 in function `UIDropDownMenuButton_OnClick':\n<string>:\"*:OnClick\":1: in function <[string \"*:OnClick\"]:1>