QB error 6189 is basically a run time error that causes disturbance while downloading company files. This error occurs because the user is using the file in multi-user mode. Well installing the tool hub can be very effective for rectifying this error as QB itself has many errors and tools to rectify them.
https://qberror.com/quickbooks-error-6189-and-816/

QuickBooks Error 6189, 816 - How to fix | QB Error
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QuickBooks Error 6189, 816 - How to fix | QB Error

QuickBooks error 6189 and 816 is a run-time error that happens while opening the QB software. Follow these 8 methods to fix QuickBooks Error Code 6189.