in reply to Net::Twitter - fatal , but no error?
The key and secret are not a Twitter username+password combo; they are an OAuth pair, and will be different from what you'd use to log into the Twitter website with your browser.
PS: have you tried enabling debugging in setup perchance?
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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