Keep getting the following error as of the latest patch (11.0.2 The War Within)

10x GreyOnCooldown/GreyOnCooldown.lua:336: attempt to call global 'GetSpellCooldown' (a nil value)
[string "@GreyOnCooldown/GreyOnCooldown.lua"]:336: in function <GreyOnCooldown/GreyOnCooldown.lua:318>
[string "=[C]"]: in function ActionButton_UpdateCooldown' [string "@Blizzard_ActionBar/Mainline/SpellFlyout.lua"]:85: in function SpellFlyoutButton_UpdateCooldown'
[string "@Blizzard_ActionBar/Mainline/SpellFlyout.lua"]:303: in function Toggle' [string "@Blizzard_FrameXML/Mainline/SecureTemplates.lua"]:339: in function handler'
[string "@Blizzard_FrameXML/Mainline/SecureTemplates.lua"]:667: in function <...ddOns/Blizzard_FrameXML/Mainline/SecureTemplates.lua:649>
[string "@Blizzard_FrameXML/Mainline/SecureTemplates.lua"]:681: in function <...ddOns/Blizzard_FrameXML/Mainline/SecureTemplates.lua:674>
[string "@Blizzard_FrameXML/Mainline/SecureTemplates.lua"]:723: in function `SecureActionButton_OnClick'
[string "@Blizzard_ActionBar/Mainline/ActionButton.lua"]:1438: in function <Blizzard_ActionBar/Mainline/ActionButton.lua:1408>
[string "=[C]"]: ?

Locals:
self = SpellFlyoutButton1 {
FlyoutArrowContainer = Frame {
}
NewActionTexture = Texture {
}
LevelLinkLockIcon = Texture {
}
Flash = SpellFlyoutButton1Flash {
}
GlyphTranslation = Texture {
}
TargetReticleAnimFrame = Frame {
}
icon = SpellFlyoutButton1Icon {
}
SlotArt = Texture {
}
AbilityHighlight = Texture {
}
InterruptDisplay = Frame {
}
GlyphActivateAnim = AnimationGroup {
}
spellID = 1462
HotKey = SpellFlyoutButton1HotKey {
}
HighlightTexture = Texture {
}
GlyphIcon = Texture {
}
spellName = "Beast Lore"
CooldownFlash = Frame {
}
IconMask = MaskTexture {
}
TextOverlayContainer = Frame {
}
AbilityHighlightAnim = AnimationGroup {
}
maxDisplayCount = 99
GlyphActivate = Texture {
}
FlyoutBorderShadow = SpellFlyoutButton1FlyoutBorderShadow {
}
SpellHighlightAnim = AnimationGroup {
}
CheckedTexture = Texture {
}
Border = SpellFlyoutButton1Border {
}
SpellHighlightTexture = Texture {
}
PushedTexture = Texture {
}
NormalTexture = SpellFlyoutButton1NormalTexture {
}
Name = SpellFlyoutButton1Name {
}
SpellCastAnimFrame = Frame {
}
SlotBackground = Texture {
}
AutoCastOverlay = Frame {
}
cooldown = SpellFlyoutButton1Cooldown {
}
Count = SpellFlyoutButton1Count {
}
}
expectedUpdate = nil
icon = SpellFlyoutButton1Icon {
}
spellID = 1462
action = nil
start = nil
duration = nil
(*temporary) = nil
(*temporary) = 1462
(*temporary) = "attempt to call global 'GetSpellCooldown' (a nil value)"
UpdateFuncCache =