I was not in combat. I just turned in a quest and this error popped up:

1x Immersion_ExtraFade\main.lua:44: attempt to call method 'Show' (a boolean value)
[string "@Immersion_ExtraFade\main.lua"]:44: in function <Immersion_ExtraFade\main.lua:36>
[string "@Immersion_ExtraFade\main.lua"]:308: in function <Immersion_ExtraFade\main.lua:277>
[string "@Immersion_ExtraFade\main.lua"]:400: in function <Immersion_ExtraFade\main.lua:395>

Locals:
frame = QuickJoinToastButton {
0 =
OnLeave = defined @FrameXML\QuickJoinToast.lua:365
OnPostShow = defined =[C]:-1
SetExternallyManagedOutroAnimation = defined =[C]:-1
SetToastDirection = defined @FrameXML\QuickJoinToast.lua:133
ToastToFriendAnim = {
}
wasShown = true
groups =

{
}
UpdateDisplayedFriendCount = defined @FrameXML\QuickJoinToast.lua:156
GetHighestPriorityGroup = defined @FrameXML\QuickJoinToast.lua:208
FriendToToastAnim = {
}
Toast = {
}
FriendsButton = {
}
OnClick = defined @FrameXML\QuickJoinToast.lua:303
ProcessQueuedUpdates = defined @FrameXML\QuickJoinToast.lua:93
ToastActiveAnim = {
}
isOnRight = false
OnShow = defined @FrameXML\QuickJoinToast.lua:37
QueueButton = {
}
ToastToFriendFinished = defined @FrameXML\QuickJoinToast.lua:445
throttle = {
}
queuedUpdates = {
}
groupsAwaitingDisplay = {
}
Show = true
QueueCount = {
}
FlashingLayer = {
}
UpdateQueueIcon = defined @FrameXML\QuickJoinToast.lua:323
ShouldSuppressAllToasts = defined @FrameXML\QuickJoinToast.lua:231
ToastToToastAnim = {
}
FriendCount = {
}
Toast2 = {
}
GetCurrentText = defined @FrameXML\QuickJoinToast.lua:397
OnManagedAlertFrameVisibilityChanged = defined =[C]:-1
HideToast = defined @FrameXML\QuickJoinToast.lua:297
ShouldDisplayGroup = defined @FrameXML\QuickJoinToast.lua:256
ToastToToastFinished = defined @FrameXML\QuickJoinToast.lua:437
CheckDisplayToast = defined @FrameXML\QuickJoinToast.lua:190
SetAlertContainer = defined =[C]:-1
OnMouseUp = defined @FrameXML\QuickJoinToast.lua:318
CheckShowToast = defined @FrameXML\QuickJoinToast.lua:184
ModifyToastDirection = defined @FrameXML\QuickJoinToast.lua:139
FriendToToastFinished = defined @FrameXML\QuickJoinToast.lua:431
SetCachedQueueData = defined @FrameXML\QuickJoinToast.lua:389
OnMouseDown = defined @FrameXML\QuickJoinToast.lua:313
HasCachedQueueData = defined @FrameXML\QuickJoinToast.lua:381
CachedQueueData = defined @FrameXML\QuickJoinToast.lua:385
ShowToast = defined @FrameXML\QuickJoinToast.lua:265
OnLoad = defined @FrameXML\QuickJoinToast.lua:5
OnEnter = defined @FrameXML\QuickJoinToast.lua:347
GetNextToastTime = defined @FrameXML\QuickJoinToast.lua:235
OnHide = defined @FrameXML\QuickJoinToast.lua:44
ClearCachedQueueData = defined @FrameXML\QuickJoinToast.lua:393
ToastPulse = defined @FrameXML\QuickJoinToast.lua:423
OnEvent = defined @FrameXML\QuickJoinToast.lua:49
QueueUpdate = defined @FrameXML\QuickJoinToast.lua:89
ProcessOrQueueUpdate = defined @FrameXML\QuickJoinToast.lua:81
GetAlertContainer = defined =[C]:-1
alertContainer = ChatAlertFrame {
}
OnPostHide = defined =[C]:-1
ManagesOwnOutroAnimation = defined =[C]:-1
ProcessUpdate = defined @FrameXML\QuickJoinToast.lua:100
SetTimerFor = defined @FrameXML\QuickJoinToast.lua:162
}
(*temporary) = true
(*temporary) = QuickJoinToastButton {
0 =
OnLeave = defined @FrameXML\QuickJoinToast.lua:365
OnPostShow = defined =[C]:-1
SetExternallyManagedOutroAnimation = defined =[C]:-1
SetToastDirection = defined @FrameXML\QuickJoinToast.

This is Mark_in_AJ from Curse by the way. =) Hi... again. lol

EDIT: I don't know why this is referencing Friends and QuickJoins etc. I just started a new Alliance character on a new server, my first Alliance character in approximately 10-11 years. I don't use my Battletag name so no friends there, and since I am on a different faction than normal and also on a totally different realm server and Battlegroup I have yet to meet or make any in-game/server friends in the ten levels that I have been here so far. /shrug