After selecting the different factions, the planet can be successfully created. However, the faction creation interface still appears and overlays on top of the planet. The interface can be dismissed by continuously selecting cancel. It is possible to select the planet normally, but the map creation process eventually gets stuck.

https://steamuserimages-a.akamaihd.net/ugc/2040731528866097237/0969542D24D7B1737274ED2208ED40F6281C9E94/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

https://steamuserimages-a.akamaihd.net/ugc/2040731528866097808/020BB762306C30E053885DCE2B12D3D7014FA962/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

https://steamuserimages-a.akamaihd.net/ugc/2040731528866097983/E3C60B886EB3BCD7D5FB86D19A5479D3576D1C70/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

https://steamuserimages-a.akamaihd.net/ugc/2040731528866106393/28698B4066F06F1251904909AFCF20989EB4CAE0/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

https://steamuserimages-a.akamaihd.net/ugc/2040731528866106629/819795BA99B44990BD021A55842507A3F83AF4B5/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

It eventually gets stuck during the "Generating map" step.

I have same problem, adding in full log:

"Mono path[0] = 'I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/Managed'
Mono config path = 'I:/SteamLibrary/steamapps/common/RimWorld/MonoBleedingEdge/etc'
Initialize engine version: 2019.4.30f1 (e8c891080a1f)
[Subsystems] Discovering subsystems at path I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/UnitySubsystems
GfxDevice: creating device client; threaded=1
Direct3D:
Version: Direct3D 11.0 [level 11.1]
Renderer: NVIDIA GeForce RTX 3060 Ti (ID=0x2489)
Vendor:
VRAM: 8038 MB
Driver: 31.0.15.3118
Begin MonoManager ReloadAssembly
- Completed reload, in 0.488 seconds
<RI> Initializing input.

<RI> Input initialized.

<RI> Initialized touch support.

UnloadTime: 1.563600 ms
RimWorld 1.4.3641 rev649
Mod is missing supported versions list in About.xml! (example: <supportedVersions><li>1.0</li></supportedVersions>)
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

Mod DeathrestDualCasket is missing packageId in About.xml! (example: <packageId>AuthorName.ModName.Specific</packageId>)
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

Fallback handler could not load library I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/Mono/data-000002862C048D20.dll
Fallback handler could not load library I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/Mono/data-000002860A65AD70.dll
Fallback handler could not load library I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/Mono/data-000002862C191A30.dll
Fallback handler could not load library I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/Mono/data-000002862C1F3A80.dll
Fallback handler could not load library I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/Mono/data-000002860A8EA710.dll
Fallback handler could not load library I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/Mono/data-000002862C7090B0.dll
[HugsLib] version 10.0.1
Translation data for language English has 1 errors. Generate translation report for more info.
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

[RealRuins][System]: RealRuins started patching at 3/9/2023 4:04:40 PM
Fallback handler could not load library I:/SteamLibrary/steamapps/common/RimWorld/RimWorldWin64_Data/Mono/data-0000028648D1ED60.dll
[RealRuins][System]: RealRuins performing manual patching optional mods at 3/9/2023 4:04:40 PM
[RealRuins][System]: SRTS not found, skipping...
[RealRuins][System]: RealRuins finished patching at 3/9/2023 4:04:40 PM (69.9549 msec)
[UnlimitedHugs.HugsLib] Patches on methods annotated as Obsolete were detected by HugsLib: Verse.Game.DeinitAndRemoveMap
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

[HugsLib] initializing RealRuins
Loaded file (Scenario) is from version 1.2.2723 rev661, we are running version 1.4.3641 rev649.
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

Could not execute post-long-event action. Exception: System.NullReferenceException: Object reference not set to an instance of an object
at RealRuins.RealRuins+Page_SelectStartingSite_PostOpen_Patch.Postfix () [0x00001] in <054f277f1b74460aa290d3a7f8b70963>:0
at (wrapper dynamic-method) RimWorld.Page_SelectStartingSite.RimWorld.Page_SelectStartingSite.PostOpen_Patch2(RimWorld.Page_SelectStartingSite)
at Verse.WindowStack.Add (Verse.Window window) [0x0003a] in <38562b1a2ab64eacb931fb5df05ca994>:0
at RimWorld.Page_CreateWorldParams.<CanDoNext>b__19_1 () [0x0000d] in <38562b1a2ab64eacb931fb5df05ca994>:0
at Verse.LongEventHandler.ExecuteToExecuteWhenFinished () [0x0007c] in <38562b1a2ab64eacb931fb5df05ca994>:0
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

Loaded file (Scenario) is from version 1.2.2723 rev661, we are running version 1.4.3641 rev649.
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug/Debug.bindings.h Line: 39)

"

Used mod list is same as poster above, bare minimum to use the mod.

i have this issue as well

Same issue, can upload log on request

Same issue here with the same modlist and mod order

Roight then, time to post my (probably first) error log.

This error occurred after world-gen, when I was shown the planet and had to pick a landing site. The world-gen screen with all the factions was still open, and I had to click BACK for it to close.

The planet was generated at 100%, Population - Crowded, with 3 extra factions.

Could not execute post-long-event action. Exception: System.NullReferenceException: Object reference not set to an instance of an object at RealRuins.RealRuins+Page SelectStartingSite PostOpen Patch.Postfix |''| [0x00001] in <ecd4f075030b40bda18e91c93acf8507>:0

RimPy Test Modlist:

Harmony
Core
Royalty
Ideology
Biotech
Hugslib
Absolutely No Roof
Achtung!
Allow Tool
Character Editor
Dubs Bad Hygiene
Vanilla Expanded Framework
Expanded Materials - Stones and Mortars
Expanded Materials - Metals
Expanded Materials - Plastics (1.3)
JecsTools
Humanoid Alien Races
Fences and Floors (Continued)
[T] MoreFloors 1.4
Stuffed Floors
More carpet and leather floors
Real Ruins
RimHUD
Subsurface Conduit
Tweaks Galore
Wall Light

The map loaded and pawns could move about the map normally.
Ruins were present and deconstructable.
Did not do anything else, as I'm in the middle of testing for failure to generate map.

It's a config problem, one of the updates added a new section that wasn't initialized properly.

To fix it, go to your Config folder (approximately C:\Users\~yourself~\AppData\LocalLow\Ludeon\Rimworld\Config) and find the one for RealRuins, likely called Mod_1552146295_RealRuins_Mod.xml if you installed it via steam.

The line that's causing the problem is

<planetaryRuinsOptions IsNull="True" />

so delete that line before you try to generate a planet again.