[R] ) Error in eval(expr, envir, enclos) : object '' not found

[mipplor]

> datafilename="E:/my documents/r/sex/bysex1.csv"
> data.sex=read.table(datafilename,header=T)
> data.sex
       y.sex.age.region.c.n
1   1980,F,A,N,-18.15,13.61
2   1980,F,A,N,-18.61,13.04
3   1980,F,A,N,-18.81,12.32
4    1990,F,A,N,-21.12,11.7
5   1990,F,A,N,-20.77,11.58
6    1990,F,A,N,-21.6,13.34
7    1990,F,A,N,-21.78,12.6

> model.anova<-aov(c~age*sex,data=data.sex)
Error in eval(expr, envir, enclos) : object 'age' not found


   i just wanna do a anova test. but the error message is as above,,,
   what should i do to shoot this problem ? Should i define the age?


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