messed up gnome theme

So I have this new installation of opensuse Leap, and since KDE Plasma
5, though very pretty, is still a bit too unstable, I am trying to learn
to use gnome.

I downloaded some themes from, and I installed them using
the tweak tool. Here is the list of files I downloaded:

/Downloads/Gnome> ls

I had already installed the gnome-shell-extensions from the repository,
so I was able to install these shell themes in the appearance tab on the
tweak tool.

After logging out and logging back in, I started to try some of these
themes. When I click on them, it would change. But something went wrong,
and when I clicked on one of them (I don’t remember which), I got the
“Oh no, something went wrong” screen, and was logged out of gnome.

I can log back in, but as you can see from the following screen shots, I
cannot enable shell themes now. If I try to turn on the user themes
extension, then it happens again.

I know that the problem is with one of those themes. Except I don’t know
which one, where it is installed, and how to remove it.

Any help would be greatly appreciated. It seems all I would have to do
is remove the offending them manually by navigating to the appropriate
directory and pulling it out. Also, I would like to just delete the
offending file. I am afraid if I clear out the entire /usr/themes/
directory, I may cause more problems, since many of those items were
installed from the repositories.

Box #1: 42.1 | KDE Plasma 5 | AMD Phenom IIX4 | 64 | 32GB
Box #2: 13.1 | KDE 4.12 | AMD Athlon X3 | 64 | 4GB
Laptop #1: 13.1 | KDE 4.12 | Core i7-2620M | 64 | 8GB
Laptop #2: 42.1 | KDE Plasma 5 | Core i7-4710HQ | 64 | 16GB