Angularjs com design de material Falha ao instanciar o módulo ngMaterial

Instalei angularjs e materialjs usando o bower.

caramanchão instalar material angular

E injetei 'ngMaterial' no meu aplicativo, mas obtendo esse erro.

Uncaught Error: [$injector:modulerr] Failed to instantiate module demoApp due to:
Error: [$injector:modulerr] Failed to instantiate module ngMaterial due to:
Error: [$injector:modulerr] Failed to instantiate module material.core due to:
Error: [$injector:unpr] Unknown provider: $mdUtilProvider

Qualquer ajuda.

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