Well, you can easily resolve the QuickBooks Error 3371 issue with the help of some quick fixes. QuickBooks is one of the best money management and accounting software, which can help you manage your funds and other money-related stuff. The major reason causing Error 3371 is missing or damaged file entitlementDataStore.ecml. You can solve this by deleting the .ecml file, firstly open the Run dialogue box and type C:\ProgramData\intuit\EntitlementClient\v8 and then in the next window remove .ecml file, then try to re-open the QuickBooks. This is how you can easily solve QuickBooks Error 3371 with few simple steps. Contact QuickBooks expert for expert help.