[R] Variable definition problem

[T. Hotchi]

Hello, what does this error message indicate and how do I avoid this? 
(sample code below)

Thank you.

-Tosh

#read in the data table
co<-read.table("co.txt",header=T,as.is=T)

for (i in 1:3){
   paste("logco",i, sep="")<-log(co$co[co$day==i])
}

Gives the error:
Error: Target of assignment expands to non-language object

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