使用pyInstaller从.py文件创建python可执行文件后，现在出现以下错误：
Traceback (most recent call last):
File "Form_with_Upload.py", line 16, in <module>
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "c:\users\mcourtn5\appdata\local\continuum\anaconda3\lib\site-packages\Py
Installer\loader\pyimod03_importers.py", line 627, in exec_module
exec(bytecode, module.__dict__)
File "bq_for_FORM.py", line 6, in <module>
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "c:\users\mcourtn5\appdata\local\continuum\anaconda3\lib\site-packages\Py
Installer\loader\pyimod03_importers.py", line 627, in exec_module
exec(bytecode, module.__dict__)
File "site-packages\PyInstaller\__init__.py", line 66, in <module>
File "site-packages\pkg_resources\__init__.py", line 472, in get_distribution
File "site-packages\pkg_resources\__init__.py", line 344, in get_provider
File "site-packages\pkg_resources\__init__.py", line 892, in require
File "site-packages\pkg_resources\__init__.py", line 778, in resolve
pkg_resources.DistributionNotFound: The 'PyInstaller' distribution was not found
and is required by the application
[13344] Failed to execute script Form_with_Upload
为什么需要将此作为依赖项？