You are missing sub new just before the beginning '{' in TryOut.pm

There _is_ a bug with the "Standard" attribute, but I haven't been able to put my finger on it just yet.

my @data :Field('Accessor' => 'data'); does generate a data accessor.

Adding the Permission=>'private' field results in

OIO::Method error: Can't call private method 'TryOut->data' from class
+ 'main'
Package: main
File: object-insideout
Line: 19
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#!/usr/bin/perl
use strict;
use warnings;

package TryOut;
use strict;
use warnings;
{
    use Object::InsideOut;
    my @data :Field('Accessor' => 'data', Permission=>'private');
}

1;

package main;

my $obj = TryOut->new();
$obj->data(42);
print $obj->data;

__END__
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