added missing argument

app.py

@@ -12,7 +12,7 @@ df = pd.read_csv("USSTHPI.csv")
 python_repl_tool = PythonAstREPLTool(locals={"df": df})
 
 import matplotlib.pyplot as nplt
-def gen_plot():
+def gen_plot(name):
     nplt.figure(figsize=(10, 5))
     nplt.plot(df['DATE'], df['USSTHPI'], label='USSTHPI')
     nplt.title('Time Series of USSTHPI')