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.beta
  > ### Title: Calculate single factor model (CAPM) beta
  > ### Aliases: SFM.beta CAPM.beta CAPM.beta.bull CAPM.beta.bear TimingRatio
  > ###   SFM.beta.bull SFM.beta.bear
  > 
  > ### ** Examples
  > 
  > 
  > data(managers)
  >     SFM.beta(managers[, "HAM1"], managers[, "SP500 TR"], Rf = managers[, "US 3m TR"])
  [1] 0.3900712
  >     SFM.beta(managers[,1:3], managers[,8:10], Rf=.035/12) 
       Beta : SP500 TR Beta : US 10Y TR Beta : US 3m TR
  HAM1           0.391           -0.359           0.692
  HAM2           0.343           -0.043           4.159
  HAM3           0.557           -0.099           4.687
  >     SFM.beta(managers[,1], managers[,8:10], Rf=.035/12, benchmarkCols=FALSE) 
                     HAM1
  Beta : SP500 TR   0.391
  Beta : US 10Y TR -0.359
  Beta : US 3m TR   0.692
  > 
  > 	     
  > 	   SFM.beta.bull(managers[, "HAM2"], 
  + 			managers[, "SP500 TR"], 
  + 			Rf = managers[, "US 3m TR"])
  [1] 0.5226596
  > 	   SFM.beta.bear(managers[, "HAM2"], 
  + 			managers[, "SP500 TR"], 
  + 			Rf = managers[, "US 3m TR"])
  [1] 0.0698255
  > 			
  > if(requireNamespace("RobStatTM", quietly = TRUE)) { # CRAN requires conditional execution
  +   betas <- SFM.beta(managers[,1:6], 
  + 			               managers[,8:10], 
  + 			               Rf=.035/12, method="Robust", 
  + 			               family="opt", bb=0.25, max.it=200, digits=4)
  + 	 betas["HAM1", ]
  + 	 betas[, "Beta : SP500 TR"]
  + 	     
  +   SFM.beta.bull(managers[, "HAM2"], 
  + 	               managers[, "SP500 TR"], 
  + 			           Rf = managers[, "US 3m TR"],
  + 			           method="Robust")
  + 			
  +   SFM.beta.bear(managers[, "HAM2"], 
  + 			           managers[, "SP500 TR"], 
  + 			           Rf = managers[, "US 3m TR"],
  + 			           method="Robust")
  + } # CRAN can have issues with RobStatTM
  > 			
  >     TimingRatio(managers[, "HAM2"], 
  + 			managers[, "SP500 TR"], 
  + 			Rf = managers[, "US 3m TR"])
  [1] 7.485224
  > 	   TimingRatio(managers[, "HAM2"], 
  + 			managers[, "SP500 TR"], 
  + 			Rf = managers[, "US 3m TR"],
  + 			method="Robust", family="mopt")
  Error in .coefficients(xRa[, n[1]], xRb[, n[2]], subset, method = method,  : 
    "package:RobStatTM" %in% search() || requireNamespace("RobStatTM",  .... is not TRUE
  Calls: TimingRatio ... SFM.coefficients -> apply -> FUN -> .coefficients -> stopifnot
  Execution halted