Everythime I pick up a dude, I see... Use of uninitialized value in subtraction (-) at CamelTrouble.perlmonks343196.pl line 286. Use of uninitialized value in addition (+) at CamelTrouble.perlmonks343196.pl line 286.

That's right. It's one of the bugs I mentioned in the description. Unfortunately I don't know how to fix it. Please help :-)

My camels seem to have no problem walking through walls, which makes avoiding the hazards to get to the Oasis after picking up all the dudes very easy.

As I explained above, the camel doesn't walk through the wall, it jumps over it ;-)