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Operation "+": no method found,
    left argument in overloaded package XML::LibXML::NodeList,
    right argument has no overloaded magic at check_server_room_temp l
+ine 13.

#!/usr/bin/perl

use warnings;
...

my $math = $temp + 5;
print $math;

<currentConditions>
    <deviceName>Storm</deviceName>
...
    </ports>
    <errorReadingSensor>0</errorReadingSensor>
</currentConditions>

#!/usr/bin/perl

...
    my $math = $temp + 5;
    print $math;
}