[R] data$ID -> I always get a NULL

[Grześ]

I have database write as .csv file.
When I want to get sth from my database I get NULL, but I know that there is
sth! 
For example:

> data$ID
NULL
> data$kod
NULL

but command like below is always recognize by R
> data[2,3]
[1] '082'

In my opinion this problem is also connect with my attempt to create a tree.
I always get errors.

> t.tree0=rpart(ID~.,t.train)
Error in eval(expr, envir, enclos) : object "ID" not found

> t.tree0=rpart(kod~.,t.train)
Error in eval(expr, envir, enclos) : object "kod" not found

What I should do to create my simple trees?
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