A Different Type of ERROR in the Unity

[cauecoelhooficial]

I have been more than a week with an error in my Unity project … I have already shown this error to my teacher, who after analyzing and testing the error for a few hours, my teacher simply does not know how to fix it.

Apparently it is a common mistake:
"NullReferenceException: Object reference not set to an instance of an object
UIManager.SetUseable (ActionButton btn, IUseable useable) (at C:/Users/Mystic Rabbit/Desktop/GameMaker/RPG v9.1/RPG/Assets/Scripts/Managers/UIManager.cs:112)
UIManager.Start () (at C:/Users/Mystic Rabbit/Desktop/GameMaker/RPG v9.1/RPG/Assets/Scripts/Managers/UIManager.cs:54)"

But the way it came up, makes it different from other mistakes …
Before you want to give a generic solution, wait a little, let me explain the question better…
My project is an RPG game, I’m following this tutorial … Exactly this step 9.2

After completing the tutorial without any error … I mean exactly like in the video, I made everything work, every skill, every function…

However, after restarting unity … The error began to appear … Just like this, everything was working well, I restarted the unity and the error appeared.

Below is a video of 1 minute, with the exact moment I finish the tutorial and restart Unity. Realize how everything is working, there is no error … After restarting the functions do not work and the error appears.

- YouTube

I’m leaving the link of the tutorial too, so you can see, that I got the same result … But unlike it, mine stops working after restarting the software.

#9.2 Unity RPG Tutorial - Action buttons

I am also leaving the link with the other topic I created for the error, as I thought it was a simple error and that someone could help me normally, I had created another topic … But as time goes by, it seems to me be some other type of problem that even my teacher could not understand … Even reviewing my actions and my scripts step by step

Unity Losing My References "NullReferenceException: Object reference not set to an instance..."

Good evening everyone, I’m a Unity beginner and I’m following a tutorial to learn how to create an RPG. So far I have not had any problems, I have been able to execute the lessons successfully. However, after completing step 9.2 without problems to, getting the same result as the teacher. I saved my project and rebooted Unity. When i open the project and play, a new error has been displayed on the console. As I did the tutorial three times to make sure I had not made any mistakes, I was able …

NOTE: I am not leaving, the script or the complete error here, because as I created another typical whole just to speak this error, most of the information is already in it.

[Brathnann]

Looking at your video, you’ll notice your sprites vanish from your skill buttons. It almost appears something wasn’t saved, which leads me to believe that something was disconnected.

If stuff is being disconnected, this would be the source of your null error. So the only solution is to figure out why it’s getting disconnected.

Unfortunately, without knowing more about the setup, it may be hard for people to help.

So, currently, I would say just reconnect everything, make sure everything is saved completely and try restarting to see if it happens again.

Also note the tutorial you’re following is over a year old, so unless you’re using the same Unity version, it’s possible something changed that may keep stuff from working correctly.