Exception in Tkinter callback
Traceback (most recent call last):
  File "Tkinter.pyo", line 1410, in __call__
  File "gui.pyo", line 89, in start_button_func
  File "ticker.pyo", line 109, in test
  File "gui.pyo", line 143, in show_remaining_time
  File "Tkinter.pyo", line 1202, in configure
  File "Tkinter.pyo", line 1193, in _configure
TclError: invalid command name ".11092736.11377000"
