CompactUnitFrame Error

[Smallinger]

x145  FrameXML\CompactUnitFrame.lua:1776: Attempt to access forbidden object from code tainted by an AddOn
Stack: [C] in function 'SetHeight'
FrameXML\CompactUnitFrame.lua:1776: in function 'DefaultCompactNamePlateFrameSetupInternal'
FrameXML\CompactUnitFrame.lua:1755: in function 'DefaultCompactNamePlateFrameSetup'
FrameXML\CompactUnitFrame.lua:1759: in function 'func'
FrameXML\CompactUnitFrame.lua:204: in function 'CompactUnitFrame_SetUpFrame'
...e\Blizzard_NamePlates\Blizzard_NamePlates.lua:108: in function 'ApplyFrameOptions'
...e\Blizzard_NamePlates\Blizzard_NamePlates.lua:84: in function 'OnNamePlateAdded'
...e\Blizzard_NamePlates\Blizzard_NamePlates.lua:44: in function <...e\Blizzard_NamePlates\Blizzard_NamePlates.lua:35>
Time: 2017/12/09 12:39:59 Index: 5/7
Locals:
(*temporary) = <unnamed> {
    0 = <userdata>
    Flash = <unnamed> {}
    showCastbar = true
    background = <unnamed> {}
    Icon = <unnamed> {}
    startChannelColor = <table> {}
    finishedCastColor = <table> {}
    iconWhenNoninterruptible = true
    Text = <unnamed> {}
    additionalFadeWidgets = <table> {}
    Spark = <unnamed> {}
    BorderShield = <unnamed> {}
    finishedColorSameAsStart = true
    startCastColor = <table> {}
    flashColorSameAsStart = true
    failedCastColor = <table> {}
    nonInterruptibleColor = <table> {}
}
(*temporary) = 8

[vis781]

The error does somewhat tell you exactly what the problem is. An addon you are using had basically broken the compact unit frames. Unless this is a known issue that someone else on here has prior experience of, the best way to find out what is going on is to disable your addons one at a time whilst replicating the circumstances in which the error occurred.

Other than that, from the error message alone I can't help further.