I'm brand new to UMA so I might be missing something, but I just started going through the Getting Started section and the first example errs out. It looks very similar to #33 but just in case here's the whole log I get. This error and the following warning occur on every frame after pressing play.
SkinnedMeshRenderer: Trying to set a mesh ("") that is unfit for use with SkinnedMeshRenderer. Most likely it doesn't have Skin information and/or is only assigned to the renderer during runtime, in which case Unity isn't aware of its use with SkinnedMeshRenderer. Mark the mesh as Readable or assign it to the renderer in the Editor before building.
UnityEngine.SkinnedMeshRenderer:set_sharedMesh(Mesh)
UMA.UMADefaultMeshCombiner:MakeRenderer(Int32, Transform) (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMADefaultMeshCombiner.cs:105)
UMA.UMADefaultMeshCombiner:EnsureUMADataSetup(UMAData) (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMADefaultMeshCombiner.cs:44)
UMA.UMADefaultMeshCombiner:UpdateUMAMesh(Boolean, UMAData, Int32) (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMADefaultMeshCombiner.cs:126)
UMA.UMAGeneratorBuiltin:UpdateUMAMesh(Boolean) (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:282)
UMA.UMAGeneratorBuiltin:HandleDirtyUpdate(UMAData) (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:226)
UMA.UMAGeneratorBuiltin:OnDirtyUpdate() (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:265)
UMA.UMAGeneratorBuiltin:Work() (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:132)
UMA.UMAGeneratorBuiltin:Update() (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:97)
This warning that happens every frame as well.
Exception in UMAGeneratorBuiltin.OnDirtyUpdate: System.NullReferenceException: Object reference not set to an instance of an object
at UMA.UMADefaultMeshCombiner.MakeRenderer (Int32 i, UnityEngine.Transform rootBone) [0x000e4] in /Users/mistermashu/games/PlagueKnight/Assets/UMA/Core/StandardAssets/UMA/Scripts/UMADefaultMeshCombiner.cs:108
at UMA.UMADefaultMeshCombiner.EnsureUMADataSetup (UMA.UMAData umaData) [0x0010f] in /Users/mistermashu/games/PlagueKnight/Assets/UMA/Core/StandardAssets/UMA/Scripts/UMADefaultMeshCombiner.cs:44
at UMA.UMADefaultMeshCombiner.UpdateUMAMesh (Boolean updatedAtlas, UMA.UMAData umaData, Int32 atlasResolution) [0x00034] in /Users/mistermashu/games/PlagueKnight/Assets/UMA/Core/StandardAssets/UMA/Scripts/UMADefaultMeshCombiner.cs:126
at UMA.UMAGeneratorBuiltin.UpdateUMAMesh (Boolean updatedAtlas) [0x00026] in /Users/mistermashu/games/PlagueKnight/Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:282
at UMA.UMAGeneratorBuiltin.HandleDirtyUpdate (UMA.UMAData data) [0x0016b] in /Users/mistermashu/games/PlagueKnight/Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:226
at UMA.UMAGeneratorBuiltin.OnDirtyUpdate () [0x0005c] in /Users/mistermashu/games/PlagueKnight/Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:265
UnityEngine.Debug:LogWarning(Object)
UMA.UMAGeneratorBuiltin:OnDirtyUpdate() (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:274)
UMA.UMAGeneratorBuiltin:Work() (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:132)
UMA.UMAGeneratorBuiltin:Update() (at Assets/UMA/Core/StandardAssets/UMA/Scripts/UMAGeneratorBuiltin.cs:97)