Update app.py

app.py

@@ -9,7 +9,7 @@ import pandas as pd
 df = pd.read_csv('HistoricalQuotes.csv')
 df['Date'] = pd.to_datetime(df['Date'], format='%m/%d/%Y')
 df.set_index('Date', inplace=True)
-df = df[['Close/Last']].rename(columns={'Close/Last': 'Close'})
+df = df[[' Close/Last']].rename(columns={' Close/Last': 'Close'})
 df = df.sort_index()
 df['Close'] = df['Close'].replace({r'\$': ''}, regex=True).astype(float)