I've used Gnucash for about a year now - Macintosh Version 3.3 Build 3.3+ (2018-09-29). Every month I open it and update the books, and output two reports. But today when opening, it gives a "-filename- could not be found.” message, and does not go to the accounts. I am very careful to not delete or move any of the files, but the file name it seeks does not exist. I find nothing in the gnucash online documentation, and cannot figure out how to ask for help on the IRC. What to do?