Sponsor FixStack
FixStack readers are builders fixing real errors in Lovable, Cursor, Bolt, Replit, Supabase, Vercel, Stripe and Next.js. Sponsorships are clearly labeled and limited to products relevant to the error being fixed.
Site-wide sponsor
$149 / month
One sponsor slot on every page plus the homepage. One sponsor at a time.
Buy nowPlatform sponsor
$59 / month
Your placement on every error page for one platform (e.g. all Supabase errors).
Buy nowError-category sponsorships
Own one error category: your callout appears inside the fix section of every page in it, right where readers are solving the problem. One sponsor per category. Pricing on request while we grow traffic; email mainstreettools@gmail.com.
- React & Next.js rendering errors (5 pages): Hydration failed because the initial UI does not match what was rendered on the server; Text content does not match server-rendered HTML; ReferenceError: window is not defined; ...
- Next.js App Router & config errors (6 pages): You're importing a component that needs useState. It only works in a Client Component; async/await is not yet supported in Client Components; Dynamic server usage: Route couldn't be rendered statically; ...
- Vercel build & deploy errors (6 pages): Command "npm run build" exited with 1; Works locally but fails on Vercel; npm ERR! ERESOLVE unable to resolve dependency tree; ...
- Serverless & Edge Function errors (4 pages): FUNCTION_INVOCATION_TIMEOUT (504); FUNCTION_INVOCATION_FAILED (500); Edge Function returned a non-2xx status code; ...
- Supabase auth errors (5 pages): Invalid JWT / JWT expired; supabaseUrl is required; Email rate limit exceeded; ...
- Supabase database & RLS errors (4 pages): new row violates row-level security policy for table; Supabase select returns an empty array (no error); relation "public.x" does not exist; ...
- Stripe payments & webhook errors (6 pages): No signatures found matching the expected signature for payload; Invalid API Key provided; You did not provide an API key; ...
- Cursor editor & agent errors (5 pages): Cursor: model is overloaded / slow requests; Cursor agent keeps making the same failed edit; cursor: command not found; ...
- Lovable & Bolt app errors (6 pages): Lovable app shows a blank white page after deploying elsewhere; Lovable/Vite: Failed to resolve import; TypeError: Cannot read properties of undefined (reading 'map'); ...
- Node & Python runtime errors (3 pages): Error: listen EADDRINUSE: address already in use; Error: Cannot find module 'express'; ModuleNotFoundError: No module named 'flask'
Founding rates while the site grows. Questions: use the contact on the About page.