If this error occurs kindly go to the options icon at the top of the Song Surgeon GUI ( Graphical User Interface).
After clicking it you will see the default paths that have been created. Using the small buttons to the right of
these paths in the dialog window, please navigate to each of the paths in this options dialog.
Verify that these paths and folders exist, and if they do not, reset them to location that do exist.
After doing that try opening the file again.