Inheritance problem with DateTime version

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package edt;

...
}

1;

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use strict;

...

# dies here
$edt->from_epoch( epoch => time() );

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DateTime::VERSION = 0.70<
1293840000
in custom module
Can't locate object method "_normalize_nanoseconds" via package "2011-
+01-01T00:00:00" at /usr/lib/perl5/DateTime.pm line 253.

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erdev1:/home/eureca/Eulerian-Eureca# perl -v

...
(with 46 registered patches, see perl -V for more detail)

Copyright 1987-2010, Larry Wall

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erdev1:/home/eureca/Eulerian-Eureca# uname -a
Linux erdev1 2.6.38-2-686-bigmem #1 SMP Sun May 8 15:43:39 UTC 2011 i6
+86 GNU/Linux

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