Expected login:password at minimum
Admin bulk user parse rejected a line because it did not contain at least login:password (colon-separated). From parseBulkUserLine.
Why this happens
Each non-empty line needs username:password. Optional forms: login:password:premium_days, login:password:email, or login:password:premium_days:email. A single token with no colon, or a malformed separator, triggers this error.
Diagnose and fix
1. Use username:password with a password of at least 8 characters.
2. Username must match allowed pattern (letters, digits, _, -, length rules).
3. Do not use commas or spaces as the main separator — use a colon between fields.
4. Fix the reported line and re-run bulk create from Manage users.