Kanwu 刊誤 "Errors in prints (i.e., books)", also called Lishi kanwu 李氏刊誤, is a book written during the very late Tang period 唐 (618-907) by Li Fu 李涪 (c. 900), about whom only scarce information is available. Lu You's 陸游 (1125-1210) Weinan ji 渭南集 says, when Wang Xingyu 王行瑜 (d. 895) rebelled, Li Fu, who was at the time chief minister of the Court of the Imperial Clan (zongzheng qing 宗正卿), urged Wang to give in and repent, but to no avail. When Wang threatened the capital city, Li Fu was exiled to Lingnan 嶺南 (south China), where he died.
Of the original 50 chapters, one is missing. The book consists mainly of critical remarks to older writings. The first of the two juan focuses on problems and shortcomings in various issues of the administrative and ritual system of the Tang dynasty. The second half is more general and discusses different topics, like Lu Fayan's 陸法言 (fl. 601) phonetic dictionary Qieyun 切韻; Li Shangyin's 李商隱 (813-c. 858) doubtful theory that Confucius' teacher was Laozi 老子, who in turn was a disciple of Zhu Qian 竺乾 (i.e, the Buddha); or mistakes in Jia Dan's 賈耽 (730-805) calendar Qiyao li 七曜歷.
The text is found in the series Xuehai leibian 百川學海, Gujin yishi 古今逸史, Gezhi congshu 格致叢書, Xuejin taoyuan 學津討原 and Shuofu 說郛.