Quantmod / xts problem " Error in `[.xts`(x, xsubset) : subscript out of bounds"

Hello all,

I got some problems while plotting OHLC intraday data
using chartSeries(), ploting of chartSeries(Cl(..) ) works through.

Who knows whats going on?
best regards,
Immanuel

-------------------

class(intradayData)

[1] "xts" "zoo"

intradayData[1:5]

Open  Close   High    Low Volume  X
2010-05-10 10:00:00 5854.5 5911.0 5925.0 5850.0   2066 NA
2010-05-10 10:10:00 5910.5 5895.0 5911.0 5887.5   1055 NA
2010-05-10 10:20:00 5895.0 5892.0 5901.0 5884.0    913 NA
2010-05-10 10:30:00 5890.0 5903.0 5904.5 5888.5    630 NA
2010-05-10 10:40:00 5903.0 5906.5 5925.0 5901.0    418 NA

chartSeries(intradayData[1:15])

Error in `[.xts`(x, xsubset) : subscript out of bounds