Hi,I am studing Guy Yolin's examples (quantstrat-I.Rnw) and I wonder
if someone can help me with this error message "

Error in initPortf("buyHold", "SPY", initDate = "1997-12-31") :
  Portfolio buyHold already exists, use updatePortf() or
addPortfInstr() to update it.In addition: There were 50 or more
warnings (use warnings() to see the first 50)"

Thanks.

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