R Visual Errors

[pcl-houghton]

Hi there,

I'm hoping to use this visual, however it is currently failing due to an error. Unfortunately, I'm not an R developer so I'm not sure what has gone wrong.

Is there a chance you could look at my error details and suggest a solution?

Error Details:
R script error.
Loading required package: ggplot2
Loading required package: grid
Loading required package: gridExtra
Warning message:
package 'gridExtra' was built under R version 3.4.2
Loading required package: wesanderson
Warning message:
package 'wesanderson' was built under R version 3.4.2
Loading required package: RColorBrewer
Loading required package: dplyr

Attaching package: 'dplyr'

The following object is masked from 'package:gridExtra':

combine

The following objects are masked from 'package:stats':

filter, lag

The following objects are masked from 'package:base':

intersect, setdiff, setequal, union

Error in levels<-(*tmp*, value = if (nl == nL) as.character(labels) else paste0(labels, :
factor level [2] is duplicated
Calls: sortDataset -> factor
Execution halted

Thanks