Songwrite gets struct.error when starting

I ran Songwrite through Bash because it wouldn't start for me otherwise. I got this:

Traceback (most recent call last):
File "/usr/bin/songwrite", line 134, in
import main
File "/usr/bin/../share/songwrite/main.py", line 21, in
import globdef, song, player, ui
File "/usr/bin/../share/songwrite/song.py", line 1352, in
END_TRACK = struct.pack(">bbb", 0xFF, 0x2F, 0x00)
struct.error: byte format requires -128 <= number <= 127