New Certificates error

Dear administrator, Greetings from Portugal! Would like to request your assistance in th following subject: -When I try to generate new vertificates Opigno gives an error (empty page) because doesn't find the certificate file or page. However, if I try to generate one in pfd format (from the two existing, one for course and one for class) the it generates the pdf with the Chuck Norris logo. How can I produce new certificates? Thank you very much! Luis