I'm sorry, but an uncaught exception occurred.
While running game code:
  File "renpy/common/000statements.rpy", line 531, in execute_call_screen
    renpy.register_statement("show screen",
TypeError: unbound method get_tooltip() must be called with Return instance as first argument (got nothing instead)
-- Full Traceback ------------------------------------------------------------
Full traceback:
  File "bk4_xtra/bk4_scripts_xtra/bk4_s_main.rpyc", line 20762, in script
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/ast.py", line 1949, in execute
    self.call("execute")
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/ast.py", line 1937, in call
    return renpy.statements.call(method, parsed, *args, **kwargs)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/statements.py", line 277, in call
    return method(parsed, *args, **kwargs)
  File "renpy/common/000statements.rpy", line 531, in execute_call_screen
    renpy.register_statement("show screen",
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/exports.py", line 2905, in call_screen
    rv = renpy.ui.interact(mouse="screen", type="screen", roll_forward=roll_forward)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/ui.py", line 297, in interact
    rv = renpy.game.interface.interact(roll_forward=roll_forward, **kwargs)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/display/core.py", line 2702, in interact
    repeat, rv = self.interact_core(preloads=preloads, trans_pause=trans_pause, **kwargs)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/display/core.py", line 3515, in interact_core
    rv = renpy.display.focus.mouse_handler(ev, x, y)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/display/focus.py", line 407, in mouse_handler
    return change_focus(new_focus, default=default)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/display/focus.py", line 362, in change_focus
    set_focused(current, newfocus.arg, newfocus.screen)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/display/focus.py", line 109, in set_focused
    new_tooltip = widget._get_tooltip()
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/display/behavior.py", line 749, in _get_tooltip
    return get_tooltip(self.action)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/display/behavior.py", line 363, in get_tooltip
    rv = get_tooltip(i)
  File "/Users/owner/Downloads/renpy-7.0.0-sdk/renpy/display/behavior.py", line 373, in get_tooltip
    return func()
TypeError: unbound method get_tooltip() must be called with Return instance as first argument (got nothing instead)
Darwin-17.7.0-x86_64-i386-64bit
Ren'Py 7.3.5.606
Four Elements Trainer 0.9.0c
Tue Nov  3 07:24:33 2020