Why am I seeing this error every time I attach a storage device?
The error you've encountered is usually the result of having another third-party NTFS driver installed. The drivers conflict with one another creating a condition where neither can function properly.
Please uninstall or disable the other NTFS driver and then try mounting the volume again.
I already uninstalled the other NTFS driver/app - or I think I did!
See the section I already dragged the other application into the Trash, but it didn't help! in I get the message 'Other NTFS drivers must be uninstalled' for further details - likely you need to perform additional steps to completely remove the other software.