Well I am 100% sure you've modified the script at some point, 'cause this was what the line used to look like when you downloaded the files:
PHP Code:
$document->setTitle("Breeding has failed...");
$document->addLangvar("This is too bad. Breeding is attempted but none of the baby adoptables have survived.");
Anyway just be careful next time, if you use an editor like notepad++ or an IDE like Netbeans, they should be able to tell you that you have messed up the syntax. A string needs to start and end with double/single quote, keep this in mind.