http://www.perlmonks.org?node_id=1027491


in reply to Moose: apply Role at Runtime (build vs. default) [solved]

Hurray, finally I solved it.
Stupid, as always in such cases.

Take a look at my attribute's code:

has 'myattr' => ( is => 'ro', isa => 'Int', lazy => 1, default => \&_build_myattr, # build => '_build_myattr', );

Simply exchanging the comment between "default" and "build" does not work and gives the mentioned error.
I also had to make a builder out of build. I had to debug deep into Moose until I found this typo

Thank You for Your patience.

And it came to pass that in time the Great God Om spake unto Brutha, the Chosen One: "Psst!"
(Terry Pratchett, Small Gods)