QuickBooks is a popular accounting application consisting of a wide range of sophisticated accounting tools, from simple bookkeeping to complex accounting. The application uses company files to store your business financial records. Quick access to company files is very important. However, you cannot access your company file due to QuickBooks Error 6143 (Can't Back up Company File). Usually, the error occurs due to the corrupt/damaged company file. An error message pops up when the error occurs, stating, "We are Sorry, but QuickBooks can not access your company file. Something went wrong. Please try starting again." If you are too annoyed by QuickBooks Error 6143 and looking for practical solutions to fix the error, go through the bog until the end.