How to Fix 'Error 42' When 'Tansee iPhone Message Transfer for Mac' is Loading Data?

Please try deleting or removing all backups located here: ~/Library/Application Support/MobileSync/Backup
Download and install the latest version of Tansee iPhone Message Transfer for Mac from here.
If the issue persists, attempt the following steps:
Backup your iPhone using Finder on your Mac.
Backup iPhone to Mac
Run Tansee without connecting your iPhone.
Under Tansee's 'iTunes backup' tab, click on your iPhone.
Extract iTunes backup file