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use strict;
use warnings;
...
);

1;

Z:\Data\Library\Dancer2>sopw.pl
Can't locate object method "isbn" via package "Lib::Book" at
...

Uncaught exception from user code:
        Can't locate object method "isbn" via package "Lib::Book" at Z
+:\Data\Library\Dancer2\sopw.pl line 9.