If you're getting this error when using BASlink, here's the solution:
Close AccountRight.
Simultaneously press the Windows and E keys on your keyboard (the Windows key is between the Ctrl and Alt keys). The File Explorer or Windows Explorer window appears.
Locate your AccountRight v19 installation folder. Here are the default installation locations. If you installed AccountRight in a different location, go to that location instead.
If using:
The installation folder is here (v19.12 or earlier)
The installation folder is here (v19.13 or later)
AccountRight Standard
C:\Standard19
N/A
AccountRight Plus
C:\Plus19
C:\PlusClassic
AccountRight Premier
C:\Premier19
C:\PremierClassic
AccountRight Enterprise
C:\Enterprise19
C:\EnterpriseClassic
Open the AccountRight installation folder.
Locate a file named baslink.txt.
Right-click the file baslink.txt and choose Delete.
Click Yes to the confirmation message.
You should now be able to successfully use BASlink. If the error persists, reinstall AccountRight.