New to R so need a hand with converting excel to a ggplot please!

I have an excel spreadsheet of two columns: RSeq value (number) and tumour_type (Normal/Cancer)

I'm trying to convert the first column to a vector variable:

rseq=FILENAME[ ,1]

but this always saves a list not a vector- not sure why though! this makes it difficult to convert to a dataframe and make a box-plot though.

Secondly I convert the second column to a factor by:

tumour_type_factor=factor(tumour_type, levels=c( "Normal", "Cancer"))

But when I run the factor it comes up with

"N/A

levels = Normal, Cancer"

so clearly it can't read the values in the column properly.

When I generate a box plot of ggplot it returns: default method not implemented for type 'list'

I have managed to do it right one time but can't replicate it! Am I importing the data wrongly from excel? I have tried .xlsl and .csv formats?

Any help much appreciated! Thanks!