R rvest:找不到函数“xpath_element”

我试图简单地复制rvest :: html_nodes()的例子,但遇到错误: library(rvest)ateam – read_html(http://www.boxofficemojo.com/movies/?id=ateam.htm)html_nodes(ateam, center) Error in do.call(method, list(parsed_selector

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