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: SFM.coefficients
  > ### Title: Calculate single factor model alpha and beta coefficients
  > ### Aliases: SFM.coefficients
  > 
  > ### ** Examples
  > 
  > 
  > data(managers)
  >      SFM.coefficients(managers[,1], managers[,8]) 
  Error in .coefficients(xRa[, n[1]], xRb[, n[2]], subset, method = method,  : 
    "package:RobStatTM" %in% search() || requireNamespace("RobStatTM",  .... is not TRUE
  Calls: SFM.coefficients ... SFM.coefficients -> apply -> FUN -> .coefficients -> stopifnot
  Execution halted