These usually occurs when you’ve changed the installation folder on a Windows 7 or higher computer. Microsoft has altered which folders are “writable” or not. We follow their recommendations on installation locations based on their new layout. If you change the installation folder, you may have changed it to a folder that Windows doesn’t allow the program to access or write to.
If you are having errors, uninstall WAM, and reinstall using the default installation folder or at least make sure you’re installing to a folder that WAM can write to. Your data file should remain intact.