dancer warning at launch

gistfile1.txt

leedo@usealice:~/usealice$ perl -MCarp::Always app.psgi 
Use of uninitialized value $_[0] in join or string at /home/leedo/perl5/lib/perl5/x86_64-linux-gnu-thread-multi/File/Spec/Unix.pm line 86
	File::Spec::Unix::catdir('File::Spec', undef) called at /home/leedo/perl5/lib/perl5/x86_64-linux-gnu-thread-multi/File/Spec/Unix.pm line 100
	File::Spec::Unix::catfile('File::Spec', undef) called at /home/leedo/perl5/lib/perl5/Dancer/FileUtils.pm line 33
	Dancer::FileUtils::d_catfile(undef, 'views') called at /home/leedo/perl5/lib/perl5/Dancer/FileUtils.pm line 39
	Dancer::FileUtils::path(undef, 'views') called at /home/leedo/perl5/lib/perl5/Dancer/Template/MicroTemplate.pm line 28
	Dancer::Template::MicroTemplate::init('Dancer::Template::MicroTemplate=HASH(0x2451e58)', 'name', 'micro_template', 'config', 'HASH(0x2488030)', 'type', 'template') called at /home/leedo/perl5/lib/perl5/Dancer/Object.pm line 15
	Dancer::Object::new('Dancer::Template::MicroTemplate', 'name', 'micro_template', 'type', 'template', 'config', 'HASH(0x2488030)') called at /home/leedo/perl5/lib/perl5/Dancer/Engine.pm line 51
	Dancer::Engine::build('Dancer::Engine', 'template', 'micro_template', 'HASH(0x18b4bf0)') called at /home/leedo/perl5/lib/perl5/Dancer/Template.pm line 17
	Dancer::Template::init('Dancer::Template', 'micro_template', 'HASH(0x18b4bf0)') called at /home/leedo/perl5/lib/perl5/Dancer/Config.pm line 36
	Dancer::Config::__ANON__('template', 'micro_template') called at /home/leedo/perl5/lib/perl5/Dancer/Config.pm line 169
	Dancer::Config::load('Dancer::Config') called at /home/leedo/perl5/lib/perl5/Dancer.pm line 201
	Dancer::import('Dancer') called at app.psgi line 1
	main::BEGIN() called at /home/leedo/perl5/lib/perl5/Dancer.pm line 1
	eval {...} called at /home/leedo/perl5/lib/perl5/Dancer.pm line 1