If you are trying to open a file through a workstation in multi-user mode and it fails, then the probable reason for the error is that QuickBooks hosting mode is off. It restricts the server of the network to share files with the workstation preventing you the access to your files. The error can be resolved by going to the ‘File’ menu and enabling the ‘Switch to multi-user mode’. For assistance in resolving the error, contact us at our cloud Hosting support number (855)-948-3651.