You can follow steps mentioned as under to fix the above-mentioned error-
Initially, switch to single user if you are currently working in a multi-user work environment.
Next, update the QuickBooks Desktop application to its newest version.
If you are working with payroll services, make sure to download the latest tax tables before updating payroll.
Quit the QuickBooks application.
On the desktop, click on the ‘Start Button’.
Within the Start Menu, click on ‘power button/arrow button near shutdown’.
Choose ‘Log Out’ from the power menu.
When you are successfully logged out, log in to Windows as an administrator using appropriate credentials.
Once you are on the desktop, right-click on the ‘QuickBooks’ application and select ‘Open’.
Call the toll-free number 855-856-0042 for more information regarding “QuickBooks error 15102”.