I got that too, it appears to be a backend issue on Miraheze's end, not local breakage. If it does not clear up by tomorrow, let me know and I'll file a report with their staff.
Topic on User talk:GentlemensDame883
Okay, thanks.
Found what was causing the error, refresh any pages that have issues to clear the cache if need be to flush them of issues.
I'm still seeing it on the Weathering with You page even when I use Incognito Mode, I'm afraid.
You may need to purge your web browser cache on your end, you could be seeing earlier saved remnants of the problem from the cache.
Okay, it seems to be gone for now.