Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘PerformanceAnalytics-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: chart.QQPlot
  > ### Title: Plot a QQ chart
  > ### Aliases: chart.QQPlot
  > 
  > ### ** Examples
  > 
  > library(MASS) 
  Error in library(MASS) : there is no package called ‘MASS’
  Execution halted