It doesn't work

[TheproCoder]

it gives many errors:-
Unable to use a named GUIStyle without a current skin. Most likely you need to move your GUIStyle initialization code to OnGUI
UnityEditor.EditorApplication:Internal_CallHierarchyHasChanged ()
ArgumentException: You can only call GUI functions from inside OnGUI.
UnityEngine.GUIUtility.CheckOnGUI () (at :0)
UnityEngine.GUI.get_skin () (at :0)
UnityEditor.ParticleSystemStyles…ctor () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleSystemStyles.Get () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.NoiseModuleUI.Init () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ModuleUI.Setup (UnityEditor.ParticleSystemUI owner, UnityEditor.SerializedObject o, System.String displayName, UnityEditor.ModuleUI+VisibilityState defaultVisibilityState) (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ModuleUI…ctor (UnityEditor.ParticleSystemUI owner, UnityEditor.SerializedObject o, System.String name, System.String displayName) (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.NoiseModuleUI…ctor (UnityEditor.ParticleSystemUI owner, UnityEditor.SerializedObject o, System.String displayName) (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleSystemUI.CreateUIModules (UnityEditor.ParticleSystemUI e, UnityEditor.SerializedObject so) (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleSystemUI.Init (UnityEditor.ParticleEffectUI owner, UnityEngine.ParticleSystem systems) (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleEffectUI.InitializeIfNeeded (System.Collections.Generic.IEnumerable`1[T] systems) (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleSystemInspector.Init (System.Boolean forceInit) (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleSystemInspector.HierarchyOrProjectWindowWasChanged () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.EditorApplication.Internal_CallHierarchyHasChanged () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.ParticleSystemUI.OnGUI (System.Single width, System.Boolean fixedWidth) (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleEffectUI.InspectorParticleSystemGUI () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleEffectUI.OnGUI () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.ParticleSystemInspector.OnInspectorGUI () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass72_0.b__0 () (at <7aeb7d7a52d04045b8a1c734633fa931>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)
GUI Error: Invalid GUILayout state in view. Verify that all layout Begin/End calls match
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

[Nina]

Hi,

What did you do in Unity? Without knowing what you did and see (apart from the error message), I’m afraid the error message does not make any sense to me.

[TheproCoder]

After restarting the issue got solved.