Error problem

I was trying to import a mesh and this error popped up:


The Sims 4 Studio - Version 3.1.3.6

System.AggregateException: One or more errors occurred. ---> System.NullReferenceException: Object reference not set to an instance of an object.

at S4Studio.Data.IO.CAS.GeometryResource.AdjustSlotRays(CASPartResource casp, IResourceProvider resources, Boolean fix_offsets, Boolean adjust_thigh_targets)

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) System.NullReferenceException: Object reference not set to an instance of an object.

at S4Studio.Data.IO.CAS.GeometryResource.AdjustSlotRays(CASPartResource casp, IResourceProvider resources, Boolean fix_offsets, Boolean adjust_thigh_targets)

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()<---


It then said something about blender but blender isn't running. I checked my task manager twice!