Getting the following errors and the Interface is not loading.

5x AllforOne/UI.lua:55: attempt to call global 'InterfaceOptions_AddCategory' (a nil value)
[string "@AllforOne/UI.lua"]:55: in function func' [string "@AllforOne/UI.lua"]:3: in function <AllforOne/UI.lua:1> [string "@AllforOne/UI.lua"]:9: in function InitializeUI'
[string "@AllforOne/UI.lua"]:127: in main chunk

Locals:
addonTable =

{
spellSequences = {
}
}
L = nil
classButtonNames = {
HUNTER = "Cast Hunter Spell"
WARRIOR = "Cast Warrior Spell"
PALADIN = "Cast Paladin Spell"
MAGE = "Cast Mage Spell"
PRIEST = "Cast Priest Spell"
EVOKER = "Cast Evoker Spell"
SHAMAN = "Cast Shaman Spell"
WARLOCK = "Cast Warlock Spell"
DEMONHUNTER = "Cast Demon Hunter Spell"
DEATHKNIGHT = "Cast Death Knight Spell"
DRUID = "Cast Druid Spell"
MONK = "Cast Monk Spell"
ROGUE = "Cast Rogue Spell"
}
defaultSpellSequences = {
HUNTER = {
}
WARRIOR = {
}
PALADIN = {
}
MAGE = {
}
PRIEST = {
}
EVOKER = {
}
SHAMAN = {
}
WARLOCK = {
}
DEMONHUNTER = {
}
DEATHKNIGHT = {
}
DRUID = {
}
MONK = {
}
ROGUE = {
}
}
optionsFrame = AllforOneOptionsFrame {
name = "AllforOne"
}
(*temporary) = nil
(*temporary) = AllforOneOptionsFrame {
name = "AllforOne"
}
(*temporary) = "attempt to call global 'InterfaceOptions_AddCategory' (a nil value)"

and

6x AllforOne/AllforOne.lua:39: attempt to call global 'loadfile' (a nil value)
[string "@AllforOne/AllforOne.lua"]:39: in main chunk

Locals:
addonName = "AllforOne"
addonTable =

{
GetRotationFunction = {
}
TutorialList = {
}
}
classes = {
1 = "DEATHKNIGHT"
2 = "DEMONHUNTER"
3 = "DRUID"
4 = "HUNTER"
5 = "MAGE"
6 = "MONK"
7 = "PALADIN"
8 = "PRIEST"
9 = "ROGUE"
10 = "SHAMAN"
11 = "WARLOCK"
12 = "WARRIOR"
13 = "EVOKER"
}
(for state) = {
1 = "DEATHKNIGHT"
2 = "DEMONHUNTER"
3 = "DRUID"
4 = "HUNTER"
5 = "MAGE"
6 = "MONK"
7 = "PALADIN"
8 = "PRIEST"
9 = "ROGUE"
10 = "SHAMAN"
11 = "WARLOCK"
12 = "WARRIOR"
13 = "EVOKER"
}
(for control) = 1
_ = 1
class = "DEATHKNIGHT"
classFile = "Interface\AddOns\AllforOne\DEATHKNIGHT.lua"
(*temporary) = nil
(*temporary) = "Interface\AddOns\AllforOne\DEATHKNIGHT.lua"
(*temporary) = "attempt to call global 'loadfile' (a nil value)"