EndLayoutGroup: BeginLayoutGroup must be called first.

Hey guys im super new to unity and ive been trying to make a health bar system for the last few days with no success. I think ive finally narrowed down the problem to a compiler error. However i have no idea why and my googling is only coming up with results for other issues that im not yet learned enough to translate to my problem. The real issue im having is my "public Slider slider;" isnt creating a variable slot in my inspector.

this code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UIElements;
5.  
6. public class HealthBar : MonoBehaviour
7. {
8.    
9.     public Slider slider;
10.  
11.     public void setMaxHealth(int health)
12.     {
13.         slider.value = health;
14.     }
15.  
16. }

Is throwing this error:
EndLayoutGroup: BeginLayoutGroup must be called first.
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr) (at /home/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:187).

Does anyone have any ideas what the problem is? Im sure its something super simple that im missing.

 

2019.3. so I did more digging and troubleshooting. I found on a brand new project it doesn't throw the error and it also creates the variable slot in the inspector. The code works on a brand new project using UnityEngine.UI instead of .UIElements. On the original project where the code doesn't work, unityengine.ui is not recognizable or valid. I just initially assumed2019.3 replaced it with .elements. But In the new project unityengine.ui is somehow recognizable. So at some point my dependencies(?) Or where ever unityengine.ui is saved got messed with and removed? I however did not mess with anything like that as far as I'm aware. I did see other people were having that issue if they downloaded and imported stuff from the asset store sometimes, and I had about 4-5 asset packages imported.

So idk. At this point I just restarted my project as I wasn't super far into it, only just started creating a health bar. Does any of that sounds familiar to you? Any advice if it happens again? Thanks for your time helping me out on this.

 

Okay well i created the HealthBar script first this time in my completely new projectand now my PlayerController script isnt recognizing any elements in my player object. What the hell is going on? i Installed the tiny RPG asset from the asset store. Im going to start a completely new one again with out downloading any assets and see if i can get both codes to "work" and show variable slots in the inspector.

 

Code (CSharp):

1. EndLayoutGroup: BeginLayoutGroup must be called first.
2. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) (at /Users/bokken/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:197)

I'm having this too when trying to modify the import settings of a texture (atlas) for UI elements in a mobile project set up for Android. It has not prevented me from building though, but I'm optimizing the project to solve certain lag and responsiveness issues that could very well be related to the size and compression of the atlases I rely on (everything happens with a delay that varies in hundreds of milliseconds so that's a lot).



I'm using these settings because the "RGBA +1 bit compressed ETC2 4 bits" throws me an error and can't compress (problem with etccompress, code 6).
The atlases are not produced by Unity but by a small plugin.
Currently working on MacOs 10.14+ and Unity 2019.4.17f1 LTS.