Fixing Next-themes Loading Issues in Preview Window

v0
1 
Failed to load "next-themes" from "blob: https://preview-previewmatch-19-kzmp6dosj3yypiwo0f3q.vusercontent.net/4f1870f5-1420-4f9b-9574-4412ea05f5c4 . Modules must be served with a valid MIME type like application/javascript.", make sure it exists.

Why cant preview, how to fix it?

4

Try asking the agent to fix. This seems to have come up a few times in the chat and users have had success by asking the agent to fix. Maybe it will in your case too (hopefully).

rcalebeek
2025-12-09 09:24:53 UTC
v0

i asked claude to review my error and it cam up with Ah, via v0.dev! Dan is het probleem dat v0.dev's preview environment moeite heeft met bepaalde packages.

## Oplossing voor v0.dev:

### Gebruik @supabase/supabase-js in plaats van @supabase/ssr

In v0.dev preview werkt dit beter:

javascript

import { createClient } from '@supabase/supabase-js'

const supabase = createClient(
  'YOUR_SUPABASE_URL',
  'YOUR_SUPABASE_ANON_KEY'
)
1 Like
5

start from that part in the chat and see what else they wrote. coudl be helpful.

1 Like
6

I’d +1 what @heystu wrote! If you’re still facing issues, I’d also recommend Duplicating the chat and see if the issue persists. :slight_smile:

1 Like
7

Hey @3131793182-6031! Just wanted to check in on your “next-themes” loading issue in the preview window. Have you found a solution, or do you still need a hand with it? Excited to help!