Sims 4 Studio System Aggregate Exception Error

Hi, i got a problem. I get this error when I try to export animations. please help


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\clipimporter.py", line 44, in <module>

load_clip(clip,rig)

File "C:\Users\[UserName]\AppData\Roaming\Blender Foundation\Blender\2.76\scripts\addons\s4studio\animation\blender.py", line 139, in load_clip

animate_bone(skeleton.pose.bones[ROOT_BONE])

KeyError: 'bpy_prop_collection[key]: key "b__ROOT__" not found'

AL lib: (EE) UpdateDeviceParams: Failed to set 44100hz, got 48000hz instead





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

at S4Studio.Blender.BlenderUtilities.ExportClip(String custom_blend, String custom_clip, String mannequin_folder, String mannequin_texture, String rig_resource)

at S4Studio.ViewModels.Animation.AnimationPackCustomContent.<>c__DisplayClass152_0.<DoExport>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\clipimporter.py", line 44, in <module>

load_clip(clip,rig)

File "C:\Users\[UserName]\AppData\Roaming\Blender Foundation\Blender\2.76\scripts\addons\s4studio\animation\blender.py", line 139, in load_clip

animate_bone(skeleton.pose.bones[ROOT_BONE])

KeyError: 'bpy_prop_collection[key]: key "b__ROOT__" not found'

AL lib: (EE) UpdateDeviceParams: Failed to set 44100hz, got 48000hz instead





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

at S4Studio.Blender.BlenderUtilities.ExportClip(String custom_blend, String custom_clip, String mannequin_folder, String mannequin_texture, String rig_resource)

at S4Studio.ViewModels.Animation.AnimationPackCustomContent.<>c__DisplayClass152_0.<DoExport>b__0()

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

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