Message: Interface\AddOns\WeakAuras\Prototypes.lua:7947: invalid option in format' Time: Sun Jan 3 23:17:32 2021 Count: 1 Stack: Interface\AddOns\WeakAuras\Prototypes.lua:7947: invalid option in format'
[string "=[C]"]: ?
[string "=[C]"]: in function format' [string "@Interface\AddOns\WeakAuras\Prototypes.lua"]:7947: in function <Interface\AddOns\WeakAuras\Prototypes.lua:7921> [string "=(tail call)"]: ? [string "@Interface\AddOns\WeakAuras\WeakAuras.lua"]:4097: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:4075> [string "@Interface\AddOns\WeakAuras\WeakAuras.lua"]:4270: in function ReplacePlaceHolders'
[string "@interface\AddOns\WeakAuras\SubRegionTypes\SubText.lua"]:275: in function ?' [string "@Interface\AddOns\WeakAuras\RegionTypes\RegionPrototype.lua"]:34: in function Notify'
[string "@interface\AddOns\WeakAuras\WeakAuras.lua"]:3840: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:3837>
[string "@interface\AddOns\WeakAuras\WeakAuras.lua"]:3927: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:3894>
[string "@interface\AddOns\WeakAuras\WeakAuras.lua"]:4010: in function UpdatedTriggerState' [string "@Interface\AddOns\WeakAuras\GenericTrigger.lua"]:817: in function ScanWithFakeEvent'
[string "@interface\AddOns\WeakAuras\GenericTrigger.lua"]:1089: in function LoadDisplays' [string "@Interface\AddOns\WeakAuras\WeakAuras.lua"]:1658: in function LoadDisplays'
[string "@interface\AddOns\WeakAuras\WeakAuras.lua"]:1482: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:1359>
[string "@interface\AddOns\WeakAuras\WeakAuras.lua"]:1514: in function `ScanForLoads'
[string "@interface\AddOns\WeakAuras\WeakAuras.lua"]:1564: in function <Interface\AddOns\WeakAuras\WeakAuras.lua:1562>

You ignore the issue template and i don't have enough information to help you, please open a new ticket

I check for last release & alpha, there is no call to format at Prototypes.lua:7947