it activates at different times. activated at different times. I have already reinstalled and cleaned the addon settings in WTF folder.

I'm getting spammed by this error since yesterday and I don't know why, changed literally nothing.

Yeah, seems to be the Defensive Buffs area I think, I removed the alter time code lines below from the Retail.lua file for now and seems to not trigger while playing my mage anymore. Might be able to get it to work by just using different spellIds here, but not entirely sure:

[342246] = { type = BUFF_DEFENSIVE }, --Alter Time (Arcane)
[110909] = { type = BUFF_DEFENSIVE, parent = 108978 }, --Alter Time (Fire/Frost)

Also getting this error. Usually when I pop alter time on my mage but has happened in various other scenarios as well since yesterday.

you have to change
[342246] = { type = BUFF_DEFENSIVE }, --Alter Time (Arcane)
with
[342245] = { type = BUFF_DEFENSIVE }, --Alter Time (Arcane)

fixed in #206
in the meantime you can go to line 240 in Addons/BigDebuffs/Retail.lua and change the parentID:

OLD

    [342246] = { type = BUFF_DEFENSIVE }, --Alter Time (Arcane)
        [110909] = { type = BUFF_DEFENSIVE, parent = 108978 }, --Alter Time (Fire/Frost) 

NEW

    [342246] = { type = BUFF_DEFENSIVE }, --Alter Time (Arcane)
        [110909] = { type = BUFF_DEFENSIVE, parent = 342246 }, --Alter Time (Fire/Frost)