Not able to find day data

[bibhuti999]

UnboundLocalError Traceback (most recent call last)
in
382
383 if name == "main":
--> 384 statistics()

in statistics()
378 restart = input('\nWould you like to restart? Type 'yes' or 'no'.\n')
379 if restart.lower() == 'yes':
--> 380 statistics()
381
382

in statistics()
328 # What is the most popular hour of day for start time?
329 popular_hour(df_filtered)
--> 330 print("That took %s seconds." % (time.time() - start_time))
331 print("\nCalculating the next statistic...")
332 start_time = time.time()

UnboundLocalError: local variable 'start_time' referenced before assignment

getting below error