Hi there, I'm Rios Troy, a technical expert in QuickBooks. My area of expertise is fixing QuickBooks Error 6073-99001. This issue typically arises from conflicts caused by numerous users accessing the same company file at the same time. Make sure that every user has exited QuickBooks, then restart the machine that is hosting the company file in order to resolve the issue. I may help further with troubleshooting and error resolution if the problem continues.