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Responder1
Muito provavelmente você está usando o pacote acronyme o atualizou recentemente. Versão mais antiga foi usada \reset@newl@belnos .auxarquivos. Recentemente, isso foi renomeado para \AC@reset@newl@bel. Arquivos mais antigos .auxestão causando agora o erro de comando indefinido. Você pode ignorar o erro ou excluir os .auxarquivos. O erro deve desaparecer quando os .auxarquivos forem reescritos com a nova versão do acronym.