error: unexpected symbol in ggplot

The following code adds rows for missing … 意外数字常量:“ggplot([复制]) - unexpected numeric constant in: … ggplot2 But avoid …. Error You can run. Error in ggplot2 A Computer Science portal for geeks. If the column names of a data.frame are started with numbers, or have spaces, aes_string() fails ... y=`2nd Col`) See Question&Answers more detail:os Trying to install ggplot 2 and I keep getting this error "Error ... unexpected r - 如何使用 ggplot2 上的标识控制堆积条形图的排序

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