span>$<span class='fu'>fit</span>(<span class='no'>iris</span>, <span class='st'>"Species"</span>)</div><div class='output co'>#&gt; <span class='error'>Error in eval(expr, envir, enclos): object 'gst' not found</span></div><div class='input'><span class='no'>gst</span>$<span class='fu'>best_iteration</span>()</div><div class='output co'>#&gt; <span class='error'>Error in eval(expr, envir, enclos): object 'gst' not found</span></div></pre>
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