QuickBooks is accounting software used in many small firm and huge companies. But, sometimes errors may occur due to mishandling QuickBooks Software. This post will tell you how to fix QuickBooks Error Code 6144 and 304 using QuickBooks File Doctor application in QuickBooks. The reason behind this error must be an interruption of the process of saving data in the company file. Now, let's fix the Error 6144 and 304 in just 7 steps, just follow the step to step. Sign-in to QuickBooks Admin account. Open QuickBooks File Doctor application. Browse the corrupted file from the browse option. A new window will open asking, "Are you on Server or Workstation", select the right option and move further. First File Doctor will scan network errors and then errors in company file. Close QuickBooks File Doctor and open software from start. If you have any problem in fixing the error or any other reason then, you can call on our toll-free number at +1 800 880 6389. Our QB professionals are here to help you by 24/7.