There's an exception raised by python just after the
"Preparing installation" stage. There seem to be an error
while manipulating a printf like format in the todo.py
Found it! There's an extra comma in todo.py, it turns a number into a
list (don't know anything about python :), line 1508.
I send a patch.
This issue has been forwarded to a developer for further action.
Fixed in latest beta.