Help with error message

I'm new to Studio and am getting an error when trying to create custom artwork to hang on the wall. When I try to import the texture file, I get this error:


The Sims 4 Studio - Version 3.1.5.6

System.NotImplementedException: The method or operation is not implemented.

at System.Runtime.CompilerServices.AsyncServices.<ThrowAsync>b__0(Object state)

at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)


Can anyone assist a newbie? Thanks!