title: Why I have Error in eval(inp, data, env) : objeto 'futime' no encontrado
body: <p>I´m new in R and now I have this code </p>
  
  <pre><code>grap &lt;- survfit(Surv(lab5$futime, lab5$fustat) ~1, data = lung)
  ggsurvplot(grap, data = lung, xlab = "Days",
             ylab = "Overall survival probability")`
  </code></pre>
  
  <p>But I have this error: </p>
  
  <blockquote>
    <p>Error in eval(inp, data, env) : objeto 'futime' no encontrado".</p>
  </blockquote>