Hi there! It appears your patch here is patching more than expected. Music-Expanded/music-expanded-framework#45

Steps to Replicate

Load CustomizeAnimals + Music Expanded Core + Music Expanded Framework, this should cause the error to pop up on load.

Thoughts

So in MEF when a theme is selected, and when the menu loads, we call ResolveReferences on SoundDefs to reload audio grains (for themes that switch sounds around). Normally this happens before mod loading I suppose, so that explains why you may've not noticed it happen for any of the vanilla sounddefs.

I figure the intent here is that textures get loaded when a thing spawns, and so the patch catches it, but it assumes all things that the patch handles are Texture2Ds.

I'm really not sure how to solve for this one 🤔 If you've got an idea of how I could swap out sounds without Resolving References I could do that, but I think a better approach would be to limit this patch.

Stacktrace

Could not load UnityEngine.Texture2D at MusicExpanded/Medieval/Medieval_Fantasy_Quest_Complete in any active mod or in base resources.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Error (string)
(wrapper dynamic-method) Verse.ContentFinder`1<UnityEngine.Texture2D>:Verse.ContentFinder`1[[UnityEngine.Texture2D, UnityEngine.CoreModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]].Get_Patch1 (string,bool)
Verse.Sound.AudioGrain_Clip/<GetResolvedGrains>d__1:MoveNext ()
Verse.Sound.SubSoundDef:<ResolveReferences>b__33_0 ()
Verse.LongEventHandler:ExecuteToExecuteWhenFinished ()
Verse.LongEventHandler:ExecuteWhenFinished (System.Action)
Verse.Sound.SubSoundDef:ResolveReferences ()
Verse.SoundDef:ResolveReferences ()
MusicExpanded.ThemeDef:ResolveSounds (MusicExpanded.ThemeDef)
MusicExpanded.Patches.MusicManagerEntry/StartPlaying:Prefix (RimWorld.MusicManagerEntry)
(wrapper dynamic-method) RimWorld.MusicManagerEntry:RimWorld.MusicManagerEntry.StartPlaying_Patch1 (RimWorld.MusicManagerEntry)
RimWorld.MusicManagerEntry:MusicManagerEntryUpdate ()
Verse.Root_Entry:Update ()

Understandably, this mod is broken with the release of 1.4. Are there any plans to update? This is one of my favorite mods, and while I can play without it, being able to edit anything about any animal sure makes games more fun.

If you need logs or whatever I can get 'em.

if I add roaming interval to any animal that doesn't have it, that animal won't appear in pen animals filter list, so I can't put it into a pen. I have to restart the game for pen animal list to update. Maybe you could force that list to update each time roaming interval is added to an animal?

https://gist.github.com/HugsLibRecordKeeper/d26414afb74309e68f9becfad3a8a0cb
the error that I am getting doesn't display into the log so

this happens when I was clicking through trolls in the mod. I didn't notice on which troll it crashed the mod settings window but I think it is on cave troll which only appears with VAE Caves installed, because it also had a problem where some other mods couldn't customize it, and the mod that shows what mod this is from doesn't display what modt he cave troll is from.