快速上手最后一步执行时出现这个问题

E:\MockingBird-main>python demo_toolbox.py -d .\samples
Traceback (most recent call last):
File "E:\MockingBird-main\demo_toolbox.py", line 2, in
from toolbox import Toolbox
File "E:\MockingBird-main\toolbox\__init__.py", line 1, in
from toolbox.ui import UI
File "E:\MockingBird-main\toolbox\ui.py", line 1, in
import matplotlib.pyplot as plt
ModuleNotFoundError: No module named 'matplotlib'

Start with the quick-start command `python demo_toolbox.py -d .\samples` and inspect `demo_toolbox.py`, `toolbox/__init__.py`, and `toolbox/ui.py`, along with the project’s dependency instructions. Determine how matplotlib is expected to be installed or declared, then rerun the command in a fresh environment and confirm the import error is resolved.

Written by the indexing model from the issue text.