File ...\anaconda3\envs\manim\lib\site-packages\manim_voiceover\voiceover_scene.py:166, in VoiceoverScene.wait_until_bookmark(self, mark)
    160 def wait_until_bookmark(self, mark: str) -> None:
    161     """Waits until a bookmark is reached.
    162
    163     Args:
    164         mark (str): The `mark` attribute of the bookmark to wait for.
    165     """
--> 166     self.safe_wait(self.current_tracker.time_until_bookmark(mark))

File ...\anaconda3\envs\manim\lib\site-packages\manim_voiceover\tracker.py:130, in VoiceoverTracker.time_until_bookmark(self, mark, buff, limit)
    128 self._check_bookmarks()
    129 if not mark in self.bookmark_times:
--> 130     raise Exception("There is no <bookmark mark='%s' />" % mark)
    131 result = max(self.bookmark_times[mark] - self.scene.renderer.time + buff, 0)
    132 if limit is not None:

Exception: There is no <bookmark mark='B' />