Password too short (min 8)
Admin bulk user parse rejected a line because the password part was shorter than 8 characters (parseBulkUserLine).
Why this happens
Format login:password (and optional days/email) requires password.length >= 8. Distinct from admin single-user edit wording (Password must be at least 8 characters when set).
Diagnose and fix
1. Lengthen the password on that line to at least 8 characters.
2. Keep colon separators; see Expected login:password at minimum for format errors.
3. Re-run bulk create from Manage users.