I can't export meshes from s4studio

So everytime I try to export a mesh for a CAS part this error message occurs (some of it is in german. I hope you don't mind):


The Sims 4 Studio - Version 3.1.3.2

System.AggregateException: One or more errors occurred. ---> System.IO.IOException: Ein angeforderter Dateivorgang war nicht erfolgreich, weil die Speicherrichtlinie diesen Dateityp nicht zulässt. Wenden Sie sich an den Systemadministrator, um weitere Informationen zu erhalten.



at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)

at System.IO.File.Copy(String sourceFileName, String destFileName, Boolean overwrite)

at S4Studio.Blender.BlenderUtilities.ExportGeom(String custom_blend, String custom_geom, String custom_texture, String caspart_name, String mannequin_folder, String mannequin_texture, String rig_resource)

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

at S4Studio.ViewModels.CAS.CASStandalone.<>c__DisplayClass74_0.<ExecuteExportMesh>b__0()

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

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

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

---> (Inner Exception #0) System.IO.IOException: Ein angeforderter Dateivorgang war nicht erfolgreich, weil die Speicherrichtlinie diesen Dateityp nicht zulässt. Wenden Sie sich an den Systemadministrator, um weitere Informationen zu erhalten.



at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)

at System.IO.File.Copy(String sourceFileName, String destFileName, Boolean overwrite)

at S4Studio.Blender.BlenderUtilities.ExportGeom(String custom_blend, String custom_geom, String custom_texture, String caspart_name, String mannequin_folder, String mannequin_texture, String rig_resource)

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

at S4Studio.ViewModels.CAS.CASStandalone.<>c__DisplayClass74_0.<ExecuteExportMesh>b__0()

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

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



In addition to that the "preview mannequin" doesn't appear anymore, it's kind of translucent..
My game paths are: 


Sims 4 Path: C:\Program Files (x86)\Origin Games\The Sims 4\
Sims 4 Documents: C:\Users\[...]\OneDrive\Documents\Electronic Arts\Die Sims 4
Blender Path: C:\Program Files\Blender Foundation\blender-2.76a-windows64\blender.exe (I tried with blender 2.76 and 2.70)

Thanks in advance