What’s the Deal With Quickbooks Error 6189 816 & How to Fix It? The features and tools that QuickBooks Desktop provides to its users make managing day-to-day financial activities effortless. However, apart from this advantage of using QuickBooks Desktop, there are drawbacks, like its proneness to errors and bugs. This article will discuss QuickBooks error 6189 816, which a user can get while opening the company file in the multi-user mode of QuickBooks Desktop. Many reasons can cause QuickBooks error code 6189 816, which you will read ahead, alongside their troubleshooting ways. QuickBooks error 6189 816 appears with an error message, which reads, “An error occurred when QuickBooks tried to access the company file.”