Errors with pre-launch patch

[Mythris29]

Getting a few errors with this after the pre-launch patch and restart on Tuesday

48x WidgetTools/Main.lua:18: attempt to call global 'IsAddOnLoaded' (a nil value)
[string "@WidgetTools/Main.lua"]:18: in function `RegisterToolbox'
[string "@WidgetTools/WidgetToolbox.lua"]:7619: in main chunk

Locals:
addon = "WidgetTools"
version = "1.11"
toolbox =

{
preDF = false
classic = false
}
(*temporary) = nil
(*temporary) = "WidgetTools"
(*temporary) = "attempt to call global 'IsAddOnLoaded' (a nil value)"
registry = {
toolbox = {
}
addons = {
}
}

---

7x WidgetTools/Main.lua:55: attempt to call global 'GetAddOnInfo' (a nil value)
[string "@WidgetTools/Main.lua"]:55: in function `?'
[string "@WidgetTools/Main.lua"]:40: in function <WidgetTools/Main.lua:39>

Locals:
self = WidgetToolsFrame {
}
wt =

{
preDF = false
classic = false
}
(*temporary) = 2
(*temporary) = nil
(*temporary) = "WidgetTools"
(*temporary) = "attempt to call global 'GetAddOnInfo' (a nil value)"
frame = WidgetToolsFrame {
}
ns = {
textures = {
}
WidgetToolbox = {
}
colors = {
}
strings = {
}
}
addonNameSpace = "WidgetTools"
registry = {
toolbox = {
}
addons = {
}
}