Books error H505 occurs when you try to open a company file that does not exist in your computer. Often, it occurs when the QB company file needs an additional configuration resulting in an abrupt shutdown of the program. You can resolve the QuickBooks error code H505 by making a new company file folder. Firstly, you will have to create a replacement folder on the hosting computer and share the company files by granting permission to access the windows. However, if you don't know how to do this, you must consider hiring an IT expert.