When attempting to open a company file that another user is using in multi-user mode in single-user mode, "QuickBooks Error 6190" appears. File access and synchronization are hindered by this difference. Validating user activity, using the QuickBooks File Doctor tool, and resolving conflicting multi-user access are all steps in troubleshooting to ensure continuous operation. Contact our QuickBooks Experts Team at 1.855.738.2784 for immediate help.