getting error importing blender mesh into sims 4 studio

Hello,

I've been following tutorials on YouTube for how to make a sims 4 hair and I've been working on trying to make Ahsoka (from Star Wars) her older montrals and lekku into the game. As far as I know I followed every step with weight painting and transferring data. I even discovered my mesh was quad and I triangulated it, but whenever I try to bring it into Sims4Studio, I get this error:


The Sims 4 Studio - Version 3.1.6.3

System.AggregateException: One or more errors occurred. ---> S4Studio.Blender.BlenderException:

File "<string>", line 2, in <module>

File "C:\ProgramData\S4Studio\Scripts\geomexporter.py", line 39, in <module>

save_geom(geom, o, body_type)

File "C:\Users\[UserName]\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\s4studio\cas\blender.py", line 123, in save_geom

blend_index = vertex_group_map[mesh_object.vertex_groups[int(vertex.groups.group)].name]

IndexError: bpy_prop_collection[index]: index 7 out of range, size 5





at S4Studio.Blender.BlenderUtilities.RunBlender(String script, String blend, Boolean background, Boolean check_version)

at S4Studio.Blender.BlenderUtilities.ImportGeom(String custom_blend, String custom_geom, Int32 body_type, String cut)

at S4Studio.ViewModels.CAS.CASLODItem.ImportMesh(BlenderUtilities blender_util, String blender_path)

at S4Studio.ViewModels.CAS.CASStandalone.<>c__DisplayClass71_0.<ExecuteImportMesh>b__0()

at System.Threading.Tasks.Task.InnerInvoke()

at System.Threading.Tasks.Task.Execute()

--- End of inner exception stack trace ---

---> (Inner Exception #0) S4Studio.Blender.BlenderException:

File "<string>", line 2, in <module>

File "C:\ProgramData\S4Studio\Scripts\geomexporter.py", line 39, in <module>

save_geom(geom, o, body_type)

File "C:\Users\[UserName]\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\s4studio\cas\blender.py", line 123, in save_geom

blend_index = vertex_group_map[mesh_object.vertex_groups[int(vertex.groups.group)].name]

IndexError: bpy_prop_collection[index]: index 7 out of range, size 5





at S4Studio.Blender.BlenderUtilities.RunBlender(String script, String blend, Boolean background, Boolean check_version)

at S4Studio.Blender.BlenderUtilities.ImportGeom(String custom_blend, String custom_geom, Int32 body_type, String cut)

at S4Studio.ViewModels.CAS.CASLODItem.ImportMesh(BlenderUtilities blender_util, String blender_path)

at S4Studio.ViewModels.CAS.CASStandalone.<>c__DisplayClass71_0.<ExecuteImportMesh>b__0()

at System.Threading.Tasks.Task.InnerInvoke()

at System.Threading.Tasks.Task.Execute()<---



I've seen other people use blender 2.78 with Sims4studio and be successful, but do I need to use a different version?

Can anyone tell me what this means so I know what to fix? Thank you so much!