The error is caused by a tab character having been inserted into your song title which is causing a failure with the generated output file name (which is trying to insert a tab, but it causes the file to fail to be saved by the PDF ilbrary either because of the OS not allowing a tab a character in the filename or some other restriction). For an example of where this is occuring, the first song title is:
The Lost Circle_<tab>001 Soprano
It will show up like a space in the song editor because Google's text edit control just displays the tab as a single space for whatever reason. So just erase that character for all of the song titles, and then it should work fine. As a side note, your csv file is the one causing the tab to be inserted, as I can see that you have a tab between _ and the number for every song title. I am going to update the code to strip out tabs from song titles to prevent this problem.
Mike
The Lost Circle_<tab>001 Soprano
It will show up like a space in the song editor because Google's text edit control just displays the tab as a single space for whatever reason. So just erase that character for all of the song titles, and then it should work fine. As a side note, your csv file is the one causing the tab to be inserted, as I can see that you have a tab between _ and the number for every song title. I am going to update the code to strip out tabs from song titles to prevent this problem.
Mike