when i open the world map my screen goes blank and 'fatality' error just spams til i hit delete these are the errors:
Error 1:
116x Mapster\Coords.lua:150: attempt to perform arithmetic on local 'left' (a nil value)
Mapster\Coords.lua:150: in function <Mapster\Coords.lua:144>
Mapster\Coords.lua:162: in function <Mapster\Coords.lua:161>

Locals:
left = nil
top = nil
width = 1002.000061
height = 668
scale = 0.870792
x = 1088
y = 564.622192
(*temporary) = 1249.437677
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to perform arithmetic on local 'left' (a nil value)"
WorldMapScrollChild = {
0 =
TiledBackground = {
}
}
GetCursorPosition = defined =[C]:-1

Error 2:
15x ...lizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:749: attempt to perform arithmetic on a nil value
...lizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:749: in function <...lizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:748>
(tail call): ?
(tail call): ?
TomTom\TomTom-v80200-1.0.7.lua:979: in function <TomTom\TomTom.lua:978>
TomTom\TomTom-v80200-1.0.7.lua:1015: in function <TomTom\TomTom.lua:999>

Locals:
self = {
0 =
MarkCanvasDirty = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:384
GetMinZoomViewRect = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:547
GetNormalizedHorizontalScroll = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:703
SetPanTarget = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:580
DenormalizeVerticalSize = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:728
IsAtMaxZoom = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:647
AccumulateMouseDeltas = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:248
areaTriggersDirty = true
ScalingMode = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:293
GetMap = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:659
IsZoomingIn = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:639
currentScrollY = 0.382641
ZoomOut = defined =[C]:-1
ShouldZoomInstantly = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:539
SetScalingMode = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:289
targetScale = 0
GetNormalizedCursorPosition = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:753
TryPanOrZoomOnClick = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:87
shouldPanOnClick = false
SetZoomTarget = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:585
normalizedPanXLerpAmount = 0.150000
NormalizeUIPosition = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:748
OnMouseUp = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:105
MarkAreaTriggersDirty = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:376
CalculateViewRect = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:551
ResetZoom = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:613
NormalizeHorizontalSize = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:716
SetNormalizedHorizontalScroll = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:698
OnLoad = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:7
Child = {
}
accumulatedMouseDeltaY = 0
SetShouldPanOnClick = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:527
accumulatedMouseDeltaX = 0
ZoomIn = defined =[C]:-1
currentScrollX = 0.500000
currentScale = 0
ShouldPanOnClick = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:531
OnCanvasSizeChanged = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:410
SetCanvasSize = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:217
normalizedZoomLerpAmount = 0.150000
FindBestLocationForClick = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:58
GetScaleForMaxZoom = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:663
CalculateLerpScaling = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:264
GetCanvasScale = defined @Blizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:682
scrollYExtentsMin = 0
DenormalizeHorizontalSize = defined @Blizzard_Ma

Error 3:
3x ...lizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:624: :SetScale(): Scale must be > 0
[C]: in function SetScale' ...lizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:624: in function InstantPanAndZoom'
...lizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:614: in function ResetZoom' ...lizzard_MapCanvas\MapCanvas_ScrollContainerMixin.lua:423: in function OnCanvasSizeChanged'
...aceBlizzard_MapCanvas\Blizzard_MapCanvas.lua:42: in function OnFrameSizeChanged' ...rfaceBlizzard_WorldMap\Blizzard_WorldMap.lua:55: in function Maximize'
FrameXML\QuestLogOwnerMixin.lua:110: in function <FrameXML\QuestLogOwnerMixin.lua:99>
[C]: in function SetDisplayState' FrameXML\QuestLogOwnerMixin.lua:81: in function HandleUserActionMaximizeSelf'
...rfaceBlizzard_WorldMap\Blizzard_WorldMap.lua:64: in function maximizedCallback' SharedXML\SharedUIPanelTemplates.lua:825: in function Maximize'
[string ":OnClick"]:1: in function <[string ":OnClick"]:1>
[C]: ?

Locals:
(*temporary) = {
0 =
TiledBackground = {
}
}
(*temporary) = 0

I cant post all errors as there are numerous, but disabling mapster has got rid of all of them

This error seems to be caused by an incompatibility with other addons. Unfortunately I can't tell you which of your other addons might be causing it. If you could find out by disabling other map-related addons, that would be helpful.