Can't Add Script Component Because the Script Class Cannot Be Found

Can't add script component because the script class cannot be found?

If you still have the old copy of the project, upgrade the Unity project to Unity 2017 first then to 2018.2.2f1.

Here are the few possible reasons you may get this error(Ordered from very likely)

1.Script name does not match class name.

If script name is called MyClass, the class name must be MyClass. This is also case-sensitive. Double check to make sure that this is not the issue. To make sure that's not the issue, copy the class name and paste it as the script name to make sure that this is not the issue.

Note that if you have have multiple classes in one script, the class name that should match with the script name is the class that derives from MonoBehaviour.

2.There is an error in your script. Since this is an upgrade, there is a chance you're using an API that is now deprecated and removed. Open your script with Visual Studio and see if there is an error there then fix it. There is usually a red line under a code that indicates there is an error.

3.Bad import with the Unity importer and its automatic upgrade script.

Things to try:

A.The first thing to do is restart the Unity Editor.

B.Right click on the Project Tab then click "Reimport All"

C.If there is still issue, the only left is deleting the problematic script and creating a new one. There is an easier way to do this if the script is attached to many GameObjects in your scene.

A.Open the script, copy its content into notepad.

B.From the Editor and on the Project tab right click on the script "CubeScript", select "Find References In Scene".

C.Unity will now only show all the GameObjects that has this script attached to them. Delete the old script. Create a new one then copy the content from the notepad to this new script. Now, you can just drag the new script to all the filtered GameObject in the scene. Do this for every script effected. This is a manual work but should fix your issues when completed.

I can't attach scripts to a GameObject Unity 2020.3.33f1

1. You checked editor console? No error logs? If yes attach console log with errors here
2. Check name your script, one of the classes in this script must named by file name
   Example: MyClass.cs contains public class MyClass : MonoBehaviour

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