我也遇到这个问题，你解决了吗

- Exception
Exception information
Type: System.NullReferenceException
Message: Object reference not set to an instance of an object.
Source: TaleWorlds.MountAndBlade.View
CallStack:
at void TaleWorlds.MountAndBlade.View.Screens.MissionScreen.ApplyBannerTextureToMesh(Mesh armorMesh, Texture bannerTexture)
at void TaleWorlds.MountAndBlade.View.Tableaus.TableauCacheManager.OnThumbnailRenderComplete(string renderId, Texture renderTarget)
at void ManagedCallbacks.EngineCallbacksGenerated.ThumbnailCreatorView_OnThumbnailRenderComplete(IntPtr renderId, NativeObjectPointer renderTarget)
+ Enhanced Stacktrace
Frame: void TaleWorlds.MountAndBlade.View.Screens.MissionScreen.ApplyBannerTextureToMesh(Mesh armorMesh, Texture bannerTexture) (IL Offset: 9)
Module: Native
Method: static System.Void TaleWorlds.MountAndBlade.View.Screens.MissionScreen::ApplyBannerTextureToMesh(TaleWorlds.Engine.Mesh armorMesh, TaleWorlds.Engine.Texture bannerTexture)
Method From Stackframe Issue: False
CIL:

Frame: void TaleWorlds.MountAndBlade.View.Tableaus.TableauCacheManager.OnThumbnailRenderComplete(string renderId, Texture renderTarget) (IL Offset: 194)
Module: Native
Method: System.Void TaleWorlds.MountAndBlade.View.Tableaus.TableauCacheManager::OnThumbnailRenderComplete(System.String renderId, TaleWorlds.Engine.Texture renderTarget)
Method From Stackframe Issue: False
CIL:

Frame: void ManagedCallbacks.EngineCallbacksGenerated.ThumbnailCreatorView_OnThumbnailRenderComplete(IntPtr renderId, NativeObjectPointer renderTarget) (IL Offset: 37)
Module: UNKNOWN
Method: static System.Void ManagedCallbacks.EngineCallbacksGenerated::ThumbnailCreatorView_OnThumbnailRenderComplete(System.IntPtr renderId, TaleWorlds.DotNet.NativeObjectPointer renderTarget)
Method From Stackframe Issue: False
CIL: