in reply to
Errors in some perl modules
Those messages are not errors, they're warnings. They are both warning you that variables are being used before they are set to anything. Imagine something like:
$var1 = "Something";
print $var1 . $var2;
You can see that $var2 has not been set to anything. In Perl that is not an error, since an undefined value becomes a blank string in string context, but it is a pointer to sloppy coding or a mistake - hence why you get the warning when perl warnings are turned on.
Update: Original had a typo where I said $var1 instead of $var2. Thanks to AnomalousMonk