QuickBooks migration error 1009 often arises when transferring the data from the Online or the Desktop version. Users utilize the migrator tool to switch between QB versions or create a yearly backup of the QBO company. However, sometimes, they get an error message stating, “1009 Internal Error: unknown exception”. Outdated windows or programs, firewall or antivirus blocking, incompatibility between QB and Windows could be some reasons for it. Troubleshoot these aspects to get rid of the migration error.

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