I need to obtain the list of genes that overlap with a list of cnvs.

The result that I would like to obtain is similar to wich you can obtain using "splitByOverlap", but in my version of R this function is not found. I this example (A: Mapping genome regions to gene symbols) works fine, but not for me (I don't know why)

Is there another way to do the same??

thank you very much in advance

Best regards