Another mod references fonts that aren't installed. So, when my mod tries to load these fonts at a bigger scale, it can't find them either.
Font errors aren't critical. If you don't mind that a few texts look different than intended by the mod author, you can ignore these errors. Otherwise, you'll need to install the missing fonts.

Couldn't find/load font 'DejaVu Sans', falling back to 'Tahoma'.. (x2)
Couldn't find/load font 'Roboto-Regular', falling back to 'Tahoma'..
Couldn't find/load font 'roboto mono', falling back to 'Tahoma'..
Couldn't find/load font 'dejavu sans mono', falling back to 'Tahoma'..
Couldn't find/load font 'Agency FB', falling back to 'Tahoma'..
Couldn't find/load font 'roboto mono', falling back to 'Tahoma'..

it's nice that you can scale the ui a little, but it significantly drops my fps. i usually have around 580 fps, but with this addon, it dropped to around 60

Now it's working properly Thanks for the update

8. DoClick - gamemodes/sandbox/gamemode/spawnmenu/creationmenu/content/contenttypes/custom.lua:72
9. InternalDoClick - lua/vgui/dtree_node.lua:63
10. fn - gamemodes/sandbox/gamemode/spawnmenu/creationmenu/content/contenttypes/custom.lua:230
11. Call - lua/ulib/shared/hook.lua:109
12. CallPopulateHook - gamemodes/sandbox/gamemode/spawnmenu/creationmenu/content/content.lua:58
13. Function - gamemodes/sandbox/gamemode/spawnmenu/creationmenu/content/content.lua:95
14. unknown - gamemodes/sandbox/gamemode/spawnmenu/creationmenu.lua:48 (x274)

[[QoL] UI & Font Scaling, "4K Scale Fix" (TTT2 Compatible)] lua/vgui/spawnicon.lua:81: attempt to index field 'Icon' (a nil value)
1. unknown - lua/vgui/spawnicon.lua:81
2. SetMinimumSize - [C]:-1
3. SetText - lua/autorun/ui_scale.lua:107
4. Init - lua/vgui/spawnicon.lua:12
5. Create - lua/includes/extensions/client/panel/scriptedpanels.lua:41
6. cp - lua/vgui/spawnicon.lua:237
7. DoPopulate - gamemodes/sandbox/gamemode/spawnmenu/creationmenu/content/contenttypes/custom.lua:162

I've checked it now, but I'm getting a different error this time
Only the font seems to be bigger

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3352777625

Should be fixed now.

[[QoL] UI & Font Scaling, "4K Scale Fix" (TTT2 Compatible)] lua/autorun/ui_scale.lua:77: attempt to perform arithmetic on field 'size' (a nil value)
1. InitUIScale - lua/autorun/ui_scale.lua:77
2. unknown - lua/autorun/ui_scale.lua:88