KTEX helper -> Error: Mhchem not loaded

Operating system

Windows

Joplin version

1.4.2

Desktop version info

Joplin 3.2.13 (prod, win32)

Client-ID: ddb12b4ba2104bb9b01d9df83475d102
Sync-Version: 3
Profil-Version: 47
Unterstützter Schlüsselbund: Ja

Revision: a898e17

Backup: 1.4.2
Katex Input Helper: 1.0.7

Sync target

Nextcloud

Editor

Markdown Editor

What issue do you have?

Hi, I have installed the Katex-Input-Helper.

When I use the Katex Dialog from the tools menu I get a window with the following message:
"Editor is downloading...

Thank you for your patience.
If the editor is not loaded properly in up to five seconds, you can try to reload by closing and re-opening the dialog. This will probably happen after a new installation of the plug-in."

After a few secons, this pop-up comes:
The Katex Input Helper could not be opened properly.
(Error: Mhchem not loaded).
Please close it and open it again).

I have re-installed the plugin already and restarted Joplin.

I think I miss something here.
Although, the Katex test dialog opens correctly.

Anyone know what I can try?

Screenshots