This error can usually be solved with a few simple steps, first if the database files are saved in your computer then test with sample company, before you try to open it or not.
· Go to Control Panel > Administrative Tools > Services
· Option named “Sage 50 Database Connection Manager”
· Right click on it and select STOP and then again right click and select START
· Now try to open the company file, it will open.
· f you are unable to stop the services and the error message says that the connection manager could not be stopped then you do not have the administrator rights on the computer.
· You need to browse to the file path, open the folder with the extension named SAJ, and then close it.
· Make sure that the Properties option is selected and see if the Read-Only mode is turned on.
· If yes, then Select it and click the button for Yes.
· Start the Sage 50 tool and open up the company file.
· Open the folder where all the SAJ files have been stored.
· Right-click the folder to select it.
· Apply the settings and select OK.
· Now open the folder again and check if all the files and folders that you need are available or not.