# Unable to set up the vercel environment during deploying the site.

When I after following every instruction I ran vercel from the cli, I also I have tried from the vercel website but it says that it is having a problem the problem log is as follows :

 Creating an optimized production build ...

✓ Compiled successfully
✓ Linting and checking validity of types
Collecting page data .tl [VercelPostgresError]: VercelPostgresError - 'missing_connection_string': You did not supply a 'connectionString' and no 'POSTGRES_URL' env var was found.
at tf (C:\Users\My\Programming\nextjs-dashboard.next\server\app\seed\route.js:60:5026)
at Object.get (C:\Users\My\Programming\nextjs-dashboard.next\server\app\seed\route.js:60:6072)
at C:\Users\My\Programming\nextjs-dashboard.next\server\app\seed\route.js:1:3990
at t.a (C:\Users\My\Programming\nextjs-dashboard.next\server\webpack-runtime.js:1:866)
at 1507 (C:\Users\My\Programming\nextjs-dashboard.next\server\app\seed\route.js:1:3883)
at t (C:\Users\My\Programming\nextjs-dashboard.next\server\webpack-runtime.js:1:127)
at C:\Users\My\Programming\nextjs-dashboard.next\server\app\seed\route.js:1:1176
at t.a (C:\Users\My\Programming\nextjs-dashboard.next\server\webpack-runtime.js:1:866)
at 2920 (C:\Users\My\Programming\nextjs-dashboard.next\server\app\seed\route.js:1:967)
at t (C:\Users\My\Programming\nextjs-dashboard.next\server\webpack-runtime.js:1:127) {
code: 'missing_connection_string'
}

Build error occurred
Error: Failed to collect page data for /seed
at C:\Users\My\Programming\nextjs-dashboard\node_modules.pnpm\next@15.0.0-rc.0_react-dom@19.0.0-rc-f994737d14-20240522_react@19.0.0-rc-f994737d14-20240522\node_modules\next\dist\build\utils.js:1274:15
at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
type: 'Error'
}
Collecting page data . ELIFECYCLE  Command failed with exit code 1.

Start with the /seed route referenced in the build error and review the deployment instructions for the required Vercel Postgres environment variables. Reproduce the deployment with the reported missing POSTGRES_URL condition, then verify that the site builds successfully after the required connection string is configured.