When a company file cannot be opened or accessed because of wrong folder permission settings, a corrupted file, or an outdated version of QuickBooks error 6189 816 is generated. Additionally, it may occur if the user tries to open a file on a network other than the one where the QuickBooks software is installed. The error message implies that the company file is inaccessible and proposes that the user restart their computer or attempt to open the file on another computer.