[R] Trying to run simple survival program in R but does not work

[Trev101]

Hey,

I am just starting to learn R now and I typed in this simple survival
program:
  
   library(survival)
   t <- c(10,13,18,19,23,30,36,38,54,56,59,75,93,97,104,107,107,107)
   c <- c(1,0,0,1,0,1,1,0,0,0,1,1,1,1,0,1,0,0)
   data <- Surv(t,c)
   km <- survfit(data)       
   summary(km)
   Call: survfit(formula = data)

but everytime I run it I get this error:
  
  Error in eval.with.vis(expr, envir, enclos) : object "Call" not found

Can someone please help me out I really have no idea wat I have done wrong.
I have installed the survival library is there maybe some other library I
need to install?
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