When attempting to access a company file, QuickBooks Error Code 6189 816 appears. This is frequently caused by problems with multi-user configuration, faulty files, or inconsistencies across QuickBooks versions. Usually, it means that the file is either inaccessible or in use. It can be fixed by accessing the QuickBooks Tool Hub, updating QuickBooks, and verifying file permissions. If you need help, please call the QB Support team at 1.855.738.2784.