QuickBooks Event Id 4 Error: What Does It Mean & How To Fix It There are high chances that users come across QuickBooks Event Id 4 error while working with QuickBooks Desktop. It pops up with an error message on the computer screen, which reads, “Integration Manager could not connect to QuickBooks. Please make sure that it is open” when it takes place.” Several factors can be behind the occurrence of QuickBooks Event Id 4 error, which we aim to discuss with you through this blog, alongside the methods that can be applied to fix it.