Unable to open the Settings page nor the "Select Variant" window

[Mostoneman]

Describe the bug
No matter what I do, I cannot open the Settings in Foundry's Configuration page, and the "Select Variant" button in the token Appearance tab does not seem to do anything. An error appears in the console when pressing the Settings button, but nothing appears when clicking the "Select Variant". Nothing happens when pressing the Shift+1,2,... even though they are configured, though Shift+G works.

Expected behavior
From what I've seen in youtube videos, I'm supposed to be able to configure the data paths in Settings, and have a window pop up when clicking the "Select Variant" button.

Screenshots

Desktop (please complete the following information):

• Foundry is hosted on a vps running Ubuntu 24.04.2 LTS
• Tested on Firefox 138.0.1 (64 bits) and Edge 136.0.3240.50 (64 bits)