env-nextjs not able to find .env variables

import { createEnv } from '@t3-oss/env-nextjs';
import { z } from 'zod';

export const env = createEnv({
  server: {
    CLERK_SECRET_KEY: z.string(),
    PLANETSCALE_DB: z.string(),
    PLANETSCALE_DB_CERT_PATH: z.string(),
    PLANETSCALE_DB_HOST: z.string(),
    PLANETSCALE_DB_USERNAME: z.string(),
    PLANETSCALE_DB_PASSWORD: z.string(),
    PLANETSCALE_DB_URL: z.string(),
  },
  client: {
    NEXT_PUBLIC_CLERK_SIGN_IN_URL: z.string(),
    NEXT_PUBLIC_CLERK_SIGN_UP_URL: z.string(),
    NEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL: z.string(),
    NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY: z.string(),
  },
  // For Next.js >= 13.4.4, you only need to destructure client variables:
  experimental__runtimeEnv: {
    NEXT_PUBLIC_CLERK_SIGN_IN_URL: process.env.NEXT_PUBLIC_CLERK_SIGN_IN_URL,
    NEXT_PUBLIC_CLERK_SIGN_UP_URL: process.env.NEXT_PUBLIC_CLERK_SIGN_UP_URL,
    NEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL: process.env.NEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL,
    NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY: process.env.NEXT_PUBLIC_PUBLISHABLE_KEY,
  },
});

❌ Invalid environment variables: {
  CLERK_SECRET_KEY: [ 'Required' ],
  PLANETSCALE_DB: [ 'Required' ],
  PLANETSCALE_DB_CERT_PATH: [ 'Required' ],
  PLANETSCALE_DB_HOST: [ 'Required' ],
  PLANETSCALE_DB_USERNAME: [ 'Required' ],
  PLANETSCALE_DB_PASSWORD: [ 'Required' ],
  PLANETSCALE_DB_URL: [ 'Required' ],
  NEXT_PUBLIC_CLERK_SIGN_IN_URL: [ 'Required' ],
  NEXT_PUBLIC_CLERK_SIGN_UP_URL: [ 'Required' ],
  NEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL: [ 'Required' ],
  NEXT_PUBLIC_PUBLISHABLE_KEY: [ 'Required' ]
}