It is not due to an old save, I started a new game and got it as well.
Here the guide to
- Fixing the Paula bug -
There are two missing things, the definition and the image.
The missing definition should be in the file: script.rpy
To fix it, open the file, go to line 102 (that line has the definition for paul) and below it add the following line:
Code:
define nvlfpaul = Character("{image=paula_port.png}", callback=new_msg, color="#dd18cd", what_prefix="{w=[msg_delay]}{cps=+50}", kind=nvl)
The missing image (fon_fpaul.jpg) does not exist, you could just make a copy of fon_paul and rename it to fix the bug. If you want to spend a bit more time you can edit the copy to add the 'a' after paul and change the image.
I did it the 2nd way but was to lazy to make it well (only 24seconds in paint), but it works. You can find the edited script file and the image in the zip attached.