[Classic] Dugi Guide not useable

I am having this issue as well. Here is the Lua error:

Date: 2019-12-30 08:29:40
ID: 1
Error occured in: Global
Count: 1
Message: …erfaceAddOnsDugisGuideViewerZDugisGuideViewer.lua line 6447:
   attempt to index global ‘C_MountJournal’ (a nil value)
Debug:
   …erfaceAddOnsDugisGuideViewerZDugisGuideViewer.lua:6447: in main chunk
Locals:
LuaUtils = <table> {
 WaitForCombatEnd = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:672
 CreateThread = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:504
 indexOf = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:176
 Profiler = <table> {
 }
 visualLines = <table> {
 }
 PrintCurrentTooltipItemLink = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1083
 RunPostCombatFunctions = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:855
 dumpVar = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:284
 dumpString = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:279
 QueueThread = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:566
 Delay = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:655
 DugiSetMapByID = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:823
 inOutQuad = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:995
 FadeOut = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1011
 isInTable = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:209
 crop = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:71
 foreach = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:167
 matchString = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:146
 normalized2HexColor = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:697
 isTableEmpty = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:156
 RemoveDuplicates = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:217
 ProcessInTime = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:931
 loopAndUnpack = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:205
 SecondsToClock = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1381
 DugiSetMapToCurrentZone = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:834
 Yield = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:592
 IsNilOrEmpty = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:142
 CamelCase = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:61
 isWindowActive = false
 DGV = <table> {
 }
 DugisDropDown = <table> {
 }
 trim = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:67
 DrawLineDugi = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1302
 DrawMarkDugi = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1207
 loop = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:187
 clone = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:626
 separateCamelCase = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:49
 collectgarbage = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:886
 RemoveKey = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:477
 AreTablesEqual = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:245
 TransferBackdropFromElvUI = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:901
 HideLine = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1148
 StopChangingLinesPositions = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1134
 StartChangingLinesPositions = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1128
 split = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:27
 CheckWindowActive = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1065
 FadeIn = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1005
 RestIfNeeded = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1049
 GetPatchVer = <function> defined @InterfaceAddOnsDugisGuideViewerZLuaUtils.lua:1017
 IsFrameVisible = <function> defined @InterfaceAddOns
AddOns:
  Swatter, v8.2.6377 (SwimmingSeadragon)
  Atlas, vv1.45.01.11302
  AtlasClassicWoW, vv1.45.00.11302.05
  AtlasLootClassic, vv1.4.4
  AtlasLootClassicData, vv1.4.4
  AtlasLootClassicDungeonsAndRaids, vv1.4.4
  AucAdvanced, v8.2.6430 (SwimmingSeadragon)
  AucFilterBasic, v8.2.6364 (SwimmingSeadragon)
  AucStatHistogram, v8.2.6366 (SwimmingSeadragon)
  AucStatiLevel, v8.2.6370 (SwimmingSeadragon)
  AucStatPurchased, v8.2.6367 (SwimmingSeadragon)
  AucStatSimple, v8.2.6399 (SwimmingSeadragon)
  AucStatStdDev, v8.2.6369 (SwimmingSeadragon)
  AucUtilFixAH, v8.2.6371 (SwimmingSeadragon)
  BeanCounter, v8.2.6434 (SwimmingSeadragon)
  Dismounter, v1.2.1
  DugisGuideViewerZ, v1.114
  SlideBar, v8.2.6375 (SwimmingSeadragon)
  Stubby, v8.2.6376 (SwimmingSeadragon)
  BlizRuntimeLib_enUS v1.13.3.11303 <none>
  (ck=327)