One possible reason for this problem is that you've defined them using my, but you've defined them in the wrong place.

For instance, if you've done

if($foo){
 my $bar = 'baz';
}
print $bar;
[download]

Then you'll get the warning that $bar is undefined, because it only exists inside the "if" block.

In other words, just adding my anywhere you declare a variable isn't going to solve your strict problems. You have to know what it means for those variables.