

Use this guide to understand and fix common errors when importing contacts in bulk using CSV files in BizStackPro.
You may run a CSV import and see errors, but it’s not always clear what caused them or how to fix them.
Import error logs show exactly which rows failed and why, helping you correct issues like formatting, duplicates, or missing data.
Without understanding these errors, you may repeat failed imports or end up with incomplete data.
This guide will show you how to troubleshoot import errors so you can fix problems quickly and complete your data upload successfully.
Once you understand how import errors work, follow the sections below to identify issues, fix your CSV file, and re-import your data inside BizStackPro.
Most import issues are caused by formatting, missing required fields, or mismatched dropdown values. Start with the error log so you fix the exact rows that failed.
| Code | Meaning | How to Fix It |
|---|---|---|
| 1001 | Unknown error | Confirm the file is a true CSV, re-save it, and retry. If needed, try a different browser. |
| 1002 | Multiple owners found | Use the user’s unique email address for the Owner field instead of a name. |
| 1004 | Invalid value | Check required fields, remove unsupported characters, and confirm values match field type. |
| 1005 | Invalid enum (dropdown) | Match dropdown values exactly as configured in the field settings (spelling/case matters). |
| 1006 | Invalid Contact ID | Export contacts to confirm valid IDs for this sub-account, or disable “update using Contact ID.” |
| 1008 | Invalid email format | Confirm every email uses a valid structure ([email protected]) and remove spaces. |
| 1010–1012 | Duplicate primary value or Contact ID | Remove duplicates in the file (email/phone/ID). Use one unique identifier per row. |
| 1013 | Phone format error | Use E.164 (+11234567890) or a valid regional format. Avoid letters and extensions in the number field. |
| 1014 | Date format error | Convert all date columns to a supported format (e.g., YYYY-MM-DD or MM/DD/YYYY) and keep it consistent. |
| 1015 | Owner not found | Use the exact user email (recommended) or exact user name that exists in the sub-account. |
If you have a lot of failures, fix the file first, then re-import rather than trying to correct one row at a time.
+11234567890). Common US formats may also work.YYYY-MM-DD).Tag1, Tag2).True/False or Yes/No.Pro Tip: Fix the file, then re-import — don’t keep retrying the same broken CSV. A clean CSV reduces partial imports and saves a ton of time.
BizStackPro supports a wide range of standard timezone values (for example: America/New_York, US/Pacific, Europe/London, Asia/Tokyo, and more).
Most countries are supported. When a country field is required, two-letter country codes (example: US, CA, IN, AU) are commonly accepted.
BizStackPro makes it easier to manage contacts, import lists, and keep your data clean — especially when your fields and formats are consistent.
Opens in a new tab.
Go to Contacts > Bulk Actions, click Show Stats, then open the Error tab.
Export your contacts to confirm valid IDs for your sub-account, or disable updating via Contact ID if you’re importing new contacts.
Remove duplicate rows for unique fields (like email, phone, or Contact ID) before re-importing.
Use E.164 when possible (example: +11234567890). Common US formats may also work.
Eliminate import headaches by fixing formatting issues early and using the error log to correct failed rows quickly.
Clean data = better automation.
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