Hi, i’m new to unity and programming. My mouse wasnt working while i was in Unity Scene. I can click and zoom but couldnt rotate. Then i deleted the ReadmeEditor script so i could learn if it’s related to my mouse movement and my mouse worked perfectly after deleting it. How should i change the lines that gives errors?
i’m sorry the script is very long. the errored lines are highlighted. how should i change them? i have no idea how a particle pack is related to my mouse movement 
InvalidCastException: Specified cast is not valid.
ReadmeSystem.Editor.ReadmeEditor.GetAllRootReadme () (at Assets/UnityTechnologies/ParticlePack/TutorialInfo/Scripts/Editor/ReadmeEditor.cs:276)
ReadmeSystem.Editor.ReadmeEditor.GetReadmeRoot () (at Assets/UnityTechnologies/ParticlePack/TutorialInfo/Scripts/Editor/ReadmeEditor.cs:292)
ReadmeSystem.Editor.ReadmeEditor.SelectReadme () (at Assets/UnityTechnologies/ParticlePack/TutorialInfo/Scripts/Editor/ReadmeEditor.cs:73)
ReadmeSystem.Editor.ReadmeEditor.SelectReadmeAutomatically () (at Assets/UnityTechnologies/ParticlePack/TutorialInfo/Scripts/Editor/ReadmeEditor.cs:59)
UnityEditor.EditorApplication.Internal_CallDelayFunctions () (at <24e1ed8728684ea3ae446f80787d18de>:0)
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.IO;
using System.Reflection;
using System.Linq;
namespace ReadmeSystem.Editor
{
[CustomEditor(typeof(Readme))]
[InitializeOnLoad]
public class ReadmeEditor : UnityEditor.Editor
{
Readme readme { get { return (Readme)target; } }
string nextReadmeTitle
{
get
{
if (readme.nextReadme == null)
return "Next";
return readme.nextReadme.title == "" ? "Next" : readme.nextReadme.title;
}
}
string prevReadmeTitle
{
get
{
if (readme.prevReadme == null)
return "Prev";
return readme.prevReadme.title == "" ? "Prev" : readme.prevReadme.title;
}
}
static bool showInEditMode = false;
static string kShowedReadmeSessionStateName = "ReadmeEditor.showedReadme";
static float kSpace = 16f;
static ReadmeEditor()
{
EditorApplication.delayCall += SelectReadmeAutomatically;
}
static void SelectReadmeAutomatically()
{
if (!SessionState.GetBool(kShowedReadmeSessionStateName, false))
{
***var readme = SelectReadme();***
if (readme)
{
SessionState.SetBool(kShowedReadmeSessionStateName, true);
}
}
}
[MenuItem("Tutorial/Show Tutorial Instructions")]
static Readme SelectReadme()
{
showInEditMode = false;
**Readme result = GetReadmeRoot();**
if (result != null)
{
Selection.objects = new UnityEngine.Object[] { result };
}
else
{
Debug.LogWarning("Couldn't find a readme");
}
return result;
}
protected override void OnHeaderGUI()
{
var readme = (Readme)target;
if (showInEditMode)
{
base.OnHeaderGUI();
return;
}
DrawHeaderGUI(readme);
}
public override void OnInspectorGUI()
{
var readme = (Readme)target;
if (showInEditMode)
{
base.OnInspectorGUI();
EditorGUILayout.BeginVertical(EditorStyles.helpBox);
showInEditMode = EditorGUILayout.Toggle("Show in Edit Mode", showInEditMode);
EditorGUI.BeginChangeCheck();
readme.isRoot = EditorGUILayout.Toggle("Set as Root", readme.isRoot);
if (EditorGUI.EndChangeCheck())
{
if (readme.isRoot)
{
Debug.Log("ResetAll");
//Ensures that there is only one readme as root.
ResetAllRootReadme();
readme.isRoot = true;
}
}
if (GUILayout.Button("Update Sections Label"))
{
ResetSectionsLabel(readme);
}
EditorGUILayout.EndVertical();
//ImportOptions
return;
}
DrawInspectorGUI(readme);
EditorGUILayout.BeginVertical(EditorStyles.helpBox);
showInEditMode = EditorGUILayout.Toggle("Show in Edit Mode", showInEditMode);
EditorGUILayout.EndHorizontal();
GUILayout.BeginHorizontal(EditorStyles.toolbar);
GUI.enabled = readme.prevReadme != null;
if (GUILayout.Button(prevReadmeTitle, EditorStyles.toolbarButton))
{
Selection.objects = new UnityEngine.Object[] { readme.prevReadme };
}
GUI.enabled = readme.nextReadme != null;
if (GUILayout.Button(nextReadmeTitle, EditorStyles.toolbarButton))
{
Selection.objects = new UnityEngine.Object[] { readme.nextReadme };
}
GUI.enabled = true;
GUILayout.EndHorizontal();
}
public static void DrawHeaderGUI(Readme readme)
{
if (readme == null)
return;
var iconWidth = Mathf.Min(EditorGUIUtility.currentViewWidth / 3f - 20f, 128f);
GUILayout.BeginHorizontal("In BigTitle");
{
GUILayout.Label(readme.icon, GUILayout.Width(iconWidth), GUILayout.Height(iconWidth));
GUILayout.Label(readme.title, ReadmeEditorStyles.TitleStyle, GUILayout.ExpandHeight(true));
}
GUILayout.EndHorizontal();
}
public static void DrawInspectorGUI(Readme readme)
{
if (readme == null)
return;
if (readme.sections == null)
return;
foreach (var section in readme.sections)
{
if (!string.IsNullOrEmpty(section.heading))
{
section.name = "Header -" + section.heading;
GUILayout.Label(section.heading, ReadmeEditorStyles.HeadingStyle);
//Add Horizontal Bar
if (section.heading != "") { EditorGUILayout.LabelField("", GUI.skin.horizontalSlider); }
}
if (!string.IsNullOrEmpty(section.text))
{
if (string.IsNullOrEmpty(section.name))
section.name = "Text: " + section.text;
GUILayout.Label(section.text, ReadmeEditorStyles.BodyStyle);
}
if (!string.IsNullOrEmpty(section.linkText))
{
if (string.IsNullOrEmpty(section.name))
section.name = "Link: " + section.text;
if (ReadmeEditorStyles.LinkLabel(new GUIContent(section.linkText)))
{
Application.OpenURL(section.url);
}
}
GUILayout.Space(kSpace);
if (section.name.Length > 20)
{
section.name = section.name.Remove(17);
section.name += "...";
}
}
}
public static void DrawImport(Readme readme)
{
}
private void ResetSectionsLabel(Readme readme)
{
foreach (var section in readme.sections)
{
section.name = "";
if (!string.IsNullOrEmpty(section.heading))
{
section.name = "Header -" + section.heading;
}
if (!string.IsNullOrEmpty(section.text))
{
if (string.IsNullOrEmpty(section.name))
section.name = "Text: " + section.text;
}
if (!string.IsNullOrEmpty(section.linkText))
{
if (string.IsNullOrEmpty(section.name))
section.name = "Link: " + section.text;
}
if (section.name.Length > 20)
{
section.name = section.name.Remove(17);
section.name += "...";
}
}
}
static List<Readme> GetAllRootReadme()
{
var ids = AssetDatabase.FindAssets("Readme t:Readme");
List<Readme> results = new List<Readme>();
foreach (string guid in ids)
{
**var readmeObject = AssetDatabase.LoadMainAssetAtPath(AssetDatabase.GUIDToAssetPath(guid));**
Readme readme = (Readme)readmeObject;
if (readme.isRoot)
{
results.Add(readme);
}
}
return results; ;
}
static Readme GetReadmeRoot()
{
**Readme result = GetAllRootReadme().FirstOrDefault();**
//Ensures that there is only one readme as root.
if (result != null)
{
ResetAllRootReadme();
result.isRoot = true;
}
return result;
}
static void ResetAllRootReadme()
{
foreach (Readme readme in GetAllRootReadme())
{
readme.isRoot = false;
}
}
}
}