在R中如何将综合的ID转换为基因符号?

I have a data.frame containing Ensembl IDs in one column; I would like to find corresponding gene symbols for the values of that column and add them to a new column in my data frame. I used bioMaRt but It couldn't find any of the Ensembl IDs!I have a data.frame containing Ensembl IDs in o