Display error of running program unity #6
Description
Or display such an error：
`UnassignedReferenceException: The variable clothSolver of GPUClothSimulation has not been assigned.
You probably need to assign the clothSolver variable of the GPUClothSimulation script in the inspector.
GPUClothSimulation.SimulateOneTimeStep () (at Assets/GPUClothSimulation/Scripts/GPUClothSimulation.cs:137)
GPUClothSimulation.Update () (at Assets/GPUClothSimulation/Scripts/GPUClothSimulation.cs:113)
NullReferenceException: Object reference not set to an instance of an object
GPUClothSimulationLegacy.DispatchKernels () (at Assets/GPUClothSimulation/Scripts/GPUClothSimulationLegacy.cs:445)
GPUClothSimulationLegacy.FixedUpdate () (at Assets/GPUClothSimulation/Scripts/GPUClothSimulationLegacy.cs:204)
IndexOutOfRangeException: Index was outside the bounds of the array.
GPUClothSimulation.Start () (at Assets/GPUClothSimulation/Scripts/GPUClothSimulation.cs:97)`