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quantmod コードを実行するとエラーが発生します。

私のコード（http://rbresearch.wordpress.com/2013/02/19/momentum-in-r-part-4-with-quantstrat/の一部）は次のとおりです。

# qstratRank.R
qstratRank <- function(symbols, init.equity=100000, top.N=1, 
                       max.size=1000, max.levels=1) {
  # The qstratRank function uses the quantstrat framework to backtest a
  # ranking or relative strength strategy
  #
  # args
  # symbols     : character vector of symbols
  # init.equity : initial equity
  # top.N       : trade the top N ranked assets
  # max.size    : maximum position size
  # max.levels  : maximum levels to scale in a trade
  # max.size and max.levels are passed to addPosLimit
  #
  # return value
  # returns a list: end.eq, returns, book, stats

  # remove variables
  suppressWarnings(rm("order_book.Rank", pos=.strategy))
  suppressWarnings(rm("account.Rank", "portfolio.Rank", pos=.blotter))
  suppressWarnings(rm("account.st", "port.st", "stock.str", "stratRank",
                      "initDate", "initEq", 'start_t', 'end_t'))


  # set initial variables
  initDate <- "1900-01-01"
  initEq <- init.equity
  port.st <- "Rank"
  account.st <- "Rank"

  # trade the top "N" ranked symbols
  N <- top.N

  # initialize quantstrat objects
  initPortf(port.st, symbols=symbols, initDate=initDate)
  initAcct(account.st, portfolios=port.st, initDate=initDate,initEq=initEq)
  initOrders(portfolio=port.st, initDate=initDate)

  # initialize a strategy object
  stratRank <- strategy("Rank")

  # there are two signals
  # the first signal is when Rank is less than or equal to N
  # (i.e. trades the #1 ranked symbol if N=1)

  stratRank <- add.indicator(strategy=stratRank, name="SMA", 
                         arguments=list(x = quote(Cl(mktdata)), n=50), label="SMA50")

  stratRank <- add.signal(stratRank, name="sigComparison", 
           arguments=list(columns=c("Close", "SMA50"), relationship="gt"), label="Cl.gt.SMA50")

  # the second signal is when Rank is greter than or equal to N
  # (i.e. trades the #1 ranked symbol if N=1)
  stratRank <- add.signal(strategy=stratRank, name="sigThreshold", 
                          arguments=list(threshold=N, column="Rank", 
                                         relationship="gt", cross=FALSE), 
                          label="Rank.gt.N")



  # add buy rule
  stratRank <- add.rule(strategy=stratRank, name='ruleSignal', 
                        arguments = list(sigcol="Cl.gt.SMA50", sigval=TRUE, 
                                         orderqty=max.size, ordertype='market', 
                                         orderside='long', pricemethod='market', 
                                         replace=FALSE, osFUN=osMaxPos), 
                        type='enter', path.dep=TRUE)



  stratRank <- add.rule(strategy=stratRank, name='ruleSignal', 
                        arguments = list(sigcol="Rank.lte.N", sigval=TRUE, 
                                         orderqty=max.size, ordertype='market', 
                                         orderside='long', pricemethod='market', 
                                         replace=FALSE, osFUN=osMaxPos), 
                        type='enter', path.dep=TRUE)

  # add exit rule
  stratRank <- add.rule(strategy = stratRank, name='ruleSignal', 
                        arguments = list(sigcol="Rank.gt.N", sigval=TRUE, 
                                         orderqty='all', ordertype='market', 
                                         orderside='long', pricemethod='market', 
                                         replace=FALSE), 
                        type='exit', path.dep=TRUE)

  #set max position size and levels
  for(symbol in symbols){ addPosLimit(port.st, symbol, initDate, max.size, max.levels) }

  print("setup completed")

  # apply the strategy to the portfolio
  start_t <- Sys.time()
  out <- try(applyStrategy(strategy=stratRank, portfolios=port.st))
  end_t <- Sys.time()
  print(end_t-start_t)

  # update Portfolio
  start_t <- Sys.time()
  updatePortf(Portfolio=port.st, Dates=paste('::', as.Date(Sys.time()), sep=''))
  end_t <- Sys.time()
  print("trade blotter portfolio update:")
  print(end_t - start_t)

  # update account
  updateAcct(account.st)

  # update ending equity
  updateEndEq(account.st)

  # get ending equity
  eq <- getEndEq(account.st, Sys.Date()) + initEq

  # view order book to confirm trades
  order.book <- getOrderBook(port.st)

  # get trade statistics
  stats <- tradeStats(port.st)

  # portfolio returns
  ret1 <- PortfReturns(port.st)
  ret1$total <- rowSums(ret1, na.rm=TRUE)

  return(list(end.eq=eq, returns=ret1, book=order.book, stats=stats))
}

次に実行します：

bt <- qstratRank(symbols=symbols, init.equity=100000, top.N=2,
                  max.size=1000, max.levels=1)

問題は、'SMA50' インジケーター、シグナル、およびルールにある可能性があります。何か案は？よろしくお願いします

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