# Survival analysis no one failed during the period of the study

I'm trying to analyze data where I found that no one failed during the period of the study. This is the Error I got, as I gave the command.

> fitsurv <- coxph(Surv(NumSessions, failed) ~ o + a + n + c + e, data=records)
Error in fitter(X, Y, strats, offset, init, control, weights = weights,  :
NA/NaN/Inf in foreign function call (arg 6)