meaning of ddply error: ‘names’ attribute [9] must be the same length as the vector [1]

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I fixed this problem I was having by converting format from POSIXlt to POSIXct as Hadley suggests above – one line of code:

    mydata$datetime<-strptime(mydata$datetime, "%Y-%m-%d %H:%M:%S") # original conversion from datetime string : > class(mydata$datetime) [1] "POSIXlt" "POSIXt" 
    mydata$datetime<-as.POSIXct(mydata$datetime) # convert to POSIXct to use in data frames / ddply

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