Issue loading library(ggbiplot)

[amepham]

> library(ggbiplot)
Loading required package: scales
Error in value[[3L]](cond) : 
  Package ‘scales’ version 1.1.1 cannot be unloaded:
 Error in unloadNamespace(package) : namespace ‘scales’ is imported by ‘ggplot2’ so cannot be unloaded

I have been able to install but not load the package either through command line or selecting from the package list in R Console as above error message is displayed. Can you advise how to address this problem?

Thanks and regards,