To solve QuickBooks Error 3371 Code 11118, the ecml file can be deleted. You must start by pressing the keyboard shortcuts Windows + R simultaneously. Then, add C:ProgramDataintuitEntitlement Clientv8 to the window's text field. In addition to this, Windows Explorer will display the aforementioned address. It is now necessary to remove the ecml file. The window needs to be shut in order to be completed. In order to re-register the item, you must restart QuickBooks.