This error happens when QuickBooks is trying to use the same 'token/ID' on multiple imports which it cannot do. To fix this error please try these steps:
- Close your QuickBooks completely
- Restart your computer
- Start QuickBooks back up and the LMN Sync tool
- Re-try the sync and it should now work.
If you continue to have any issues after trying these steps, please let us know by emailing firstname.lastname@example.org or contacting out support through the Live Chat option.