This error occurs after Quickbooks has been cloned. A QuickBooks file is always encrypted, and if this file is missing or corrupted, the error arises. In addition to outdated QuickBooks, damaged Windows MSXML files, and unsaved.QBO files can also cause problems. By removing EntitlementDataStore.ECML, Quickbooks License Errors can be resolved. Cloning your computer's hard drive will improve performance. However, QuickBooks was also transferred from the old computer to the new one. Consequently, you get the QuickBooks License Error after clone.