Parallel route slot without default.tsx

next/parallel-route-defaulterrornextjs-16correctness

Why it matters

Since Next.js 16 every @slot needs an explicit default.js; the build fails without one.

Fix

Add default.tsx to the slot (return null, or notFound(), for slots with nothing to show).

Credit

  • From the Next.js team

    Next.js 16 requires an explicit default.js for every parallel route slot.

References