invalid environment variables

I logged all variables all of them are undefined, what might have gone wrong?
{
  DATABASE_URL: undefined,
  NEXTAUTH_SECRET: undefined,
  NEXTAUTH_URL: undefined,
  GOOGLE_CLIENT_ID: undefined,
  GOOGLE_CLIENT_SECRET: undefined,
  NEXT_PUBLIC_BACKEND_URL: undefined,
  NEXT_PUBLIC_BACKEND_WS_URL: undefined
}
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