Can't Battle Test anymore!

Hello everyone!
I was able to run everythingtill up to 1.5.2
The last time I worked on my Project I didn't changed anything skillswise, actorswise, stats or anything of the like.
All the yanfly plugins I was using was on their latest Version aswell.
So two days ago when the Version 1.6.0 was still active I tried to battle test and got an error.
I googled and found out that I had to replace my index file with one from a new created Project to clear that error which I also did.
The error was fixed but for that was replaced with this one:

So I googled again and tried everything I could find on the net but without any success.
I checked if my sideview battlers had the float Animation on them and took it even out, checked all skills but it still doesn't help. :(
Tried again after the update bac to 1.5.2 but it still occurs.
So I thought I'll ask for help here in the hope I won't have to recreate everything.
Thanks a lot in advance!

Did you update the index.html file and the libs folder?

I already wrote that I replaced the index.html. :p
The update back to 1.5.2 was made automatically through Steam though so I don't know what you mean with "updating the libs Folder".
Do I have to do a different type of update? :o

I'd just start a brand new project in 5.2 and copy across your data, img, audio files and the plugins.js file and plugins folder.

But this would overwrite the Placement of my Images and would mess up all the Settings of my extra images wouldnt it?
Also all my plugins and Settings of them too right?

No, it wouldn't - if you copy exactly the files shaz mentioned, then you would copy those settings as well.
The only thing theoretically lost would be edits to the core files - and that is what this is intended to do, to make sure all core files are changed to the current versions.

Well I tried it but I still get the same error. :(

Well I went back and replaced all the plugins with older versions after I reloaded my backup of the Project to see if it will help. Nothing changed!
So I deactivated a few battle based plugins, checked all the files again and nothing changes. The stupid error keeps appearing.
On the top of it nobody seems to be able to help. :(
If it were only the beginning of my Project with a few Things done I wouldn't mind to redo it but I'm working for over a year on it and have loads of maps, characters, scripts, enemies, troops, skills, animations in it that would take forever to redo.
It's totally frustrating!

We can not help you without info.
If that update didn't solve the problem, then most likely one of your Plugins has caused this.
Please provide a Screenshot of the console output of that error (press f8 when that message appears) as well as screenshots of your entire plugin manager.

Ah thanks about the info with the F8! :)
It's really helpful!
Here the result:

It seems that the pixi script is causing the Problem.

OK, your Screenshot shows a mass of known problems that could have been avoided, and you need to change several things before continuing.

1) never place your projects inside the steam folder.
Steam controls and changes anything in that folder, and you'll be always risking damage to your files. Move your entire project folder to a different place that has no special functions assigned.

2) remove all spaces from your folder names.
As said again and again, MV requires all files and foldernames to follow networking rules, and that means no spaces, latin letters only and limited special symbols as well.

3) it looks as if the core updates were prevented by steam, because those errors still point to older or wrong versions of the index.html that should have been replaced by the updates we described above.

Edit:
4) and where is the screenshot of the plugin manager? That info is needed as well.

1) Will do.
2)Hmm... That's strange since steam itself created all these Folders through the RPGmakerMV Installation.
Which means that RPGMaker created all these names with spaces.
The reason they are showed with Special Symbols is windows itself that does that and to be honest I have all that for 4 years and never had any issues.
The only folder with spaces that goes on me is the name of my Project/Game but at the same time I only typed the Name at the Project creation, RPGMakerMv created the Folder with spaces itself like everything else during the Installation.

3)All updates were made automatically through steam and everything were working until the last updated that caused the Problem obviously.

4)Didn't thought it's needed since I didn't added any new plugins after the latest update but there you go:

2) no, those checks for the folder were done by Windows, and Windows has an override that allows it to load the wrong file if the correct one does not exist.
However, that will not work after deployment - See how the error messages replaced spaces with %20? That is exactly because the browser can't handle spaces correctly.

3) steam only updates the editor automatically, never the projects (with the exceptions of the 1.6.0). And you need to manually update your projects to solve the Problem, the instructions for project updates are in every update topic on this forum (exactly because those are not automatic)

4) your yanfly plugins are in the wrong order.
Please go to yanfly's Website and reorder your plugins into exactly the order given in his list.
After that delete your savegames and start a new game, because that reordering will make all your older saves incompatible.

2) I see! Thanks for the Explanation. :)
3) Ok! Will check on that again and retry to see if I missed something.
4) I didn't changed the order and it worked like that Prior to the update, also have a older copy of my Project on my Laptop that still works like that. Couldn't use it to update this one though to fix the Problem since this Project build is far ahead and I didn't used my Laptop one for over a year.
Thanks a lot for all the help!
Have a great day! :)

You still need to fix the order. Yanfly himself states that there will be issues if you don't have them in the correct order. Some of the functionality won't work.

Yep, I understood that! :p
Would had gone through all of them to make sure anyway. :)
Thanks for the help!

Well... the Problem unfortunately still remains. :(
1) I moved my Project out from the steam Folder
2) Changed the Name of the Folder by removing the spaces, reloaded the Project on the Editor.
3) Updated the Project accordingly by following the instructions (removing files, replacing the others with ones from a new Project and so son...)
4) placed the yanfly scripts the way he described on his site while removing the no more supported ctb battle one and changing under the core engine the battle System to the default one.
5) deleted the save files of my Project and even tried without the package one aswell.

EDIT: I found out the Problem now! It's yanflys plugin BattleStatusWindow. After I deactivated it I can battle test again.
Thanks a lot for all the help! :)