Please give a full log, or nobody can help.

I had sent the complete log on the link, but I'll send it here, as I said, I'm a layman. The error message follows in the first link: https://imgur.com/a/tg0uvnz

the error log (final part as the complete part is very long):

Initializing new game with mods:
- erdelf.HumanoidAlienRaces
- brrainz.harmony
- jecrell.jecstools
- Fluffy.ModManager
- SmashPhil.VehicleFramework
- RimThunder.Core
- Ludeon.RimWorld
- OskarPotocki.VanillaFactionsExpanded.Core
- UnlimitedHugs.HugsLib
- VanillaExpanded.VWE
- VanillaExpanded.VWEQ
- VanillaExpanded.VWEL
- VanillaExpanded.VWEHW
- VanillaExpanded.VWEC
- OskarPotocki.VanillaFactionsExpanded.SettlersModule
- VanillaExpanded.VWEFT
- rimfridge.kv.rw
- LWM.DeepStorage
- VanillaExpanded.VWEG
- sarg.alphaanimals
- CETeam.CombatExtended
- MYDE.AerocraftFramework
- RimThunderTeams.RimThunder.FlyingChariot
- TheSimpleDude42.ToolsOPlenty
- VanillaExpanded.VFEArchitect
- NR.vanillaexpanded.vfearchitectPTBR
- VanillaExpanded.VFEFarming
- NR.vanillaexpanded.vfefarming
- VanillaExpanded.VFEMedical
- NR.vanillaexpanded.vfemedicalPTBR
- VanillaExpanded.VFESecurity
- NR.vanillaexpanded.vfesecurityPTBR
- VanillaExpanded.VFEPower
- NR.vanillaexpanded.vfepowerPTBR
- RimThunderTeams.RimThunder.ArdennesAssault
- vanillaexpanded.outposts
- VanillaExpanded.VAEAccessories
- VanillaExpanded.VAEEndAndExt
- VanillaExpanded.VanillaTradingExpanded
- VanillaExpanded.VAPPE
- VanillaExpanded.VARME
- VanillaExpanded.VCEF
- VanillaExpanded.VChemfuelE
- VanillaExpanded.VEE
- VanillaExpanded.VFEArt
- VanillaExpanded.VFECore
- VanillaExpanded.VFEProduction
- VanillaExpanded.VPlantsE
- VanillaExpanded.VTEXE
- VanillaExpanded.VTEXVariations
- VanillaExpanded.VWEMS
- VanillaExpanded.VWENL
- KIT.VEPortuguesePack
- OskarPotocki.VanillaVehiclesExpanded
- flangopink.xcomSkyranger
- Haplo.Miscellaneous.Robots
- Alaestor.MiscRobots.PlusPlus
- sumghai.medpod
- roolo.RunAndGun
- KIT.PortuguesePack
- 3HSTltd.Framework
- 3HSTltd.MedEvac
- ChJees.Androids14
- peptide.androidsexpanded14
- coldzero.archotech.droids
- Xercaine.Androids.BattleDroidArmor
- Xercaine.TransportDrone
- jelly.aett14
- Xercaine.AndroidsExpanded.ThinkTankMedicineCrafting
- jelly.aerancher14
- jelly.aeff14
- Xercaine.AndroidsExpanded.AssemblyKits
- Meltup.AdvancedPowerPlus
- Xercaine.AssemblyDrone
- mastertea.RandomPlus
- NR.vanillavehiclesexpandedPTBR
- Fluffy.Pharmacist
- ADE.AdvancedTurrets.Mod
- ADE.AdvancedTurretsA.copy.Mod
- Orion.Hospitality
- Killathon.AndroidTiersReforged
- Jaxe.RimHUD
- Demulidor12.RimHUD.PortugueseBrazilian
- Torann.RimWar
- Crustypeanut.WCE2.Core
- co.uk.epicguru.meleeanimation
- Saakra.Empire
- void.charactereditor
- tk421storm.PriorityTreatmentRessurected
- CaesarV6.DamageIndicators
- Oblitus.AnimalsLogic
- Simmin.AnimalsForage
- Vesper.NotMyFault
- smashphil.dropspot
- NR.aerocraftframeworktransPTBR
- vanillaexpanded.skills
- VanillaExpanded.VanillaAnimalsExpanded
- NR.vanillafactionsexpandedPTBR
- JangoDsoul.SimpleStorage
- Adamas.HospitalityCasino
- tammybee.whereismyweapon
- Lucifer.RealisticRooms
- smashphil.srtsexpanded
- Uuugggg.SmartMedicine
- Dubwise.Rimefeller
- Mlie.RecipeIcons
- Ogliss.TheWhiteCrayon.Quarry
- Owlchemist.GiddyUp
- Ykara.elStrages.EPOE
- jecrell.doorsexpanded
- automatic.bionicicons
- Dubwise.DubsMintMenus
- Jaxe.Bubbles
- Taveron.IncreasedStack
- UnlimitedHugs.AllowTool
- Fluffy.Blueprints
- brrainz.cameraplus
- Fluffy.ColonyManager
- avilmask.CommonSense
- Fluffy.AnimalTab
- CrashM.ColorCodedMoodBar.11
- UnlimitedHugs.DefensivePositions
- FrozenSnowFox.FilthVanishesWithRainAndTime
- Fluffy.FollowMe
- Fluffy.MedicalTab
- Fluffy.FluffyRelations
- Fluffy.WorkTab
- Mehni.PickUpAndHaul
- hatti.qualitybuilder
- Uuugggg.ReplaceStuff
- Uuugggg.ShareTheLoad
- dhultgren.smarterconstruction
- GT.Sam.TilledSoil
- Murmur.WallLight
- ratys.rtfuse
- weilbyte.snapout
- IwoRosiak.Holsters
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
(wrapper dynamic-method) Verse.Game:Verse.Game.InitNewGame_Patch0 (Verse.Game)
Verse.Root_Play/<>c:<Start>b__1_2 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__27_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()

Exception from asynchronous event: System.ArgumentNullException: Value cannot be null.
Parameter name: key
at System.Collections.Generic.Dictionary`2[TKey,TValue].FindEntry (TKey key) [0x00008] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.Collections.Generic.Dictionary`2[TKey,TValue].TryGetValue (TKey key, TValue& value) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at Verse.FleckManager..ctor () [0x00031] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.FleckManager..ctor (Verse.Map parent) [0x00000] in <cd7169108ea74757aa50c5b33d275c15>:0
at (wrapper dynamic-method) Verse.Map.Verse.Map.ConstructComponents_Patch2(Verse.Map)
at (wrapper dynamic-method) Verse.MapGenerator.Verse.MapGenerator.GenerateMap_Patch1(Verse.IntVec3,RimWorld.Planet.MapParent,Verse.MapGeneratorDef,System.Collections.Generic.IEnumerable`1<Verse.GenStepWithParams>,System.Action`1<Verse.Map>)
at (wrapper dynamic-method) Verse.Game.Verse.Game.InitNewGame_Patch0(Verse.Game)
at Verse.Root_Play+<>c.<Start>b__1_2 () [0x00011] in <cd7169108ea74757aa50c5b33d275c15>:0
at Verse.LongEventHandler.RunEventFromAnotherThread (System.Action action) [0x00008] in <cd7169108ea74757aa50c5b33d275c15>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch1 (string)
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__27_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()

checking editor settings...
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
CharacterEditor.CEditor/ModData:OnSettingsChanged (bool,bool)
CharacterEditor.CEditor:OnSettingsChanged (bool,bool)
CharacterEditor.CEditor:OnMainMenuInit ()
(wrapper dynamic-method) RimWorld.MainMenuDrawer:RimWorld.MainMenuDrawer.Init_Patch1 ()
(wrapper dynamic-method) Verse.UIRoot_Entry:Verse.UIRoot_Entry.Init_Patch2 (Verse.UIRoot_Entry)
Verse.Root:<Start>b__6_0 ()
Verse.Root:Start ()
Verse.Root_Entry:Start ()

bodysizes genes are active
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
CharacterEditor.GeneTool:EnDisableBodySizeGenes ()
CharacterEditor.CEditor/ModData:OnSettingsChanged (bool,bool)
CharacterEditor.CEditor:OnSettingsChanged (bool,bool)
CharacterEditor.CEditor:OnMainMenuInit ()
(wrapper dynamic-method) RimWorld.MainMenuDrawer:RimWorld.MainMenuDrawer.Init_Patch1 ()
(wrapper dynamic-method) Verse.UIRoot_Entry:Verse.UIRoot_Entry.Init_Patch2 (Verse.UIRoot_Entry)
Verse.Root:<Start>b__6_0 ()
Verse.Root:Start ()
Verse.Root_Entry:Start ()

CharacterEditor v1.4.1242 ...done
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
CharacterEditor.CEditor:OnMainMenuInit ()
(wrapper dynamic-method) RimWorld.MainMenuDrawer:RimWorld.MainMenuDrawer.Init_Patch1 ()
(wrapper dynamic-method) Verse.UIRoot_Entry:Verse.UIRoot_Entry.Init_Patch2 (Verse.UIRoot_Entry)
Verse.Root:<Start>b__6_0 ()
Verse.Root:Start ()
Verse.Root_Entry:Start ()

that is not the full log in the slightest, I have a guide for that at the end of the mod page

Here: https://gist.github.com/HugsLibRecordKeeper/eb279ff124766551fc7c414c84de4b33

Well... lots of issues in that one.
LoadOrder is entirely off, and you seem to have mods for 1.3.
One of them is trying to define certain effects called flecks, and the game tries to cause some of them during map gen.. which is what is failing you.

OK, how do you know what mod it is? It's already late here, but tomorrow morning I'll try to remove groups of mods to try to find the problem. When talking about flecks I remember [FSF] Filth Vanishes With Rain And Time which is on the mod list.

Eureka! the mod FSF] Filth Vanishes With Rain And Time was the problem, resolved (for now :D)