Update app.py

app.py

@@ -973,6 +973,7 @@ with ui.navset_card_tab(id="tab"):
             mpl.rcParams.update(mpl.rcParamsDefault)
             fig = plot_loss_rates(df, '14M')
             import tempfile
+            fd, path = tempfile.mkstemp(suffix = '.svg')
             if fig:
                 fig.savefig(path)
                 return {"src": str(path), "width": "600px", "format":"svg"}