WowAce

What version of Grid2  are you using (Version is displayed in General/About Tab) ?

 2.8.8

What game client version, classic or retail, windows or mac and language are you using ?

 WotLK Classic, Windows 10, German

What steps will reproduce the problem?

  Trying to change any color. When the color dialogue open up, BugSack is also opening and showing the error code
Did you try having Grid2 as the only enabled addon and everything else disabled?

 No! But I tried it directly and found out: the addon "Bagnon" was causing all the problem! Fortunately I don't use it at all, so it was easy to remove it from my computer. Now everything is fine...thank you :)

Do you have an error log of what happened? If you don't see any errors, make sure that error reporting is enabled (`/console scriptErrors 1`) or install [BugSack](https://mods.curse.com/addons/wow/BugSack).

 Just for the sake of completness...maybe you can change something so these addons will work well together in future:

1x ...Libs/AceGUI-3.0-41/widgets/AceGUIWidget-ColorPicker.lua:80: attempt to call method 'GetColorAlpha' (a nil value)
[string "@Grid2Options/Libs/AceGUI-3.0-41/widgets/AceGUIWidget-ColorPicker.lua"]:80: in function `opacityFunc'
[string "*ColorPickerFrame.xml:133_OnValueChanged"]:2: in function <[string "*ColorPickerFrame.xml:133_OnValueChanged"]:1>
[string "=[C]"]: in function `SetValue'
[string "*ColorPickerFrame.xml:147_OnShow"]:3: in function <[string "*ColorPickerFrame.xml:147_OnShow"]:1>
[string "=[C]"]: in function `Show'
[string "@Interface_Wrath/FrameXML/UIParent.lua"]:2799: in function `ShowUIPanel'
[string "@FrameXML/UIDropDownMenu.lua"]:1452: in function `OpenColorPicker'
[string "@BagBrother/libs/Sushi-3.2-1/classes/checks/Color.lua"]:23: in function `SetupColorPickerAndShow'
[string "@Grid2Options/Libs/AceGUI-3.0-41/widgets/AceGUIWidget-ColorPicker.lua"]:94: in function <...Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:56>

Locals:
r = 0.172549
g = 0.486275
b = 0.517647
(*temporary) = nil
(*temporary) = ColorPickerFrame {
BottomLeftCorner = Texture {
}
OnBackdropLoaded = <function> defined @SharedXML/Backdrop.lua:152
GetBackdropColor = <function> defined @SharedXML/Backdrop.lua:390
TopLeftCorner = Texture {
}
RightEdge = Texture {
}
SetupColorPickerAndShow = <function> defined @BagBrother/libs/Sushi-3.2/classes/checks/Color.lua:23
ApplyBackdrop = <function> defined @SharedXML/Backdrop.lua:294
SetBackdrop = <function> defined @SharedXML/Backdrop.lua:329
ClearBackdrop = <function> defined @SharedXML/Backdrop.lua:282
hasOpacity = true
GetBackdropBorderColor = <function> defined @SharedXML/Backdrop.lua:409
GetBackdrop = <function> defined @SharedXML/Backdrop.lua:347
SetBorderBlendMode = <function> defined @SharedXML/Backdrop.lua:266
opacity = 0
func = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:71
backdropInfo = <table> {
}
OnBackdropSizeChanged = <function> defined @SharedXML/Backdrop.lua:182
HasBackdropInfo = <function> defined @SharedXML/Backdrop.lua:278
GetEdgeSize = <function> defined @SharedXML/Backdrop.lua:188
cancelFunc = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:85
0 = <userdata>
TopEdge = Texture {
}
previousValues = <table> {
}
TopRightCorner = Texture {
}
Center = Texture {
}
SetupTextureCoordinates = <function> defined @SharedXML/Backdrop.lua:214
SetBackdropBorderColor = <function> defined @SharedXML/Backdrop.lua:422
BottomEdge = Texture {
}
BottomRightCorner = Texture {
}
SetupPieceVisuals = <function> defined @SharedXML/Backdrop.lua:246
SetBackdropColor = <function> defined @SharedXML/Backdrop.lua:399
LeftEdge = Texture {
}
opacityFunc = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:78
}
(*temporary) = "attempt to call method 'GetColorAlpha' (a nil value)"
ColorCallback = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:21
self = <table> {
a = 1
b = 0.517647
parent = <table> {
}
g = 0.486275
OnAcquire = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:129
SetDisabled = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:156
userdata = <table> {
}
base = <table> {
}
HasAlpha = true
type = "ColorPicker"
SetHasAlpha = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:152
r = 0.172549
text = FontString {
}
events = <table> {
}
AceGUIWidgetVersion = 28
colorSwatch = Texture {
}
frame = Button {
}
SetLabel = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:140
SetColor = <function> defined @Grid2Options/Libs/AceGUI-3.0/widgets/AceGUIWidget-ColorPicker.lua:144
}

Update your other addons, you have an out of date addon installed with incorrect/old acegui library.

https://www.wowace.com/projects/grid2/issues/1285