[SOLVED] Importing Mesh Error

Hello, I'm very new to blender and I starting facing a lot of issues, I managed to fix some but some I cannot fix on my own and I need your help to solve it!

I started converting meshes from different games into TS4, Sadly my first project failed so I started a new one, everything was going good and I finished the mesh but while trying to "Import Mesh" in S4Studio I got an error that I don't understand nor know how to fix, I will be posting the error below, any help would be much appreciated!

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The Sims 4 Studio - Version 3.1.2.6

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

File "<string>", line 1, in <module>

File "<string>", line 39, in <module>

File "C:\Users\[UserName]\AppData\Roaming\Blender Foundation\Blender\2.70\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 70 out of range, size 61





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 1, in <module>

File "<string>", line 39, in <module>

File "C:\Users\[UserName]\AppData\Roaming\Blender Foundation\Blender\2.70\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 70 out of range, size 61





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()<---

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