"Want to fix QuickBooks Error 15276 without calling support or wasting hours online? This guide is your shortcut. Simple, clear steps to solve the problem — so you can get back to what matters: running your business." The QuickBooks error code 15276 » probably brings in warning message that states: QuickBooks could not update the component because one or more of the files are in use. Please close all applications that are currently running on your computer, restart QuickBooks and try again. Though the error might seem to be a little nasty, but fixing the issue becomes easy with the steps we will be discussing later in this segment.