如何修复webassets.exceptions.filterror:找不到程序文件：sass

我正在编辑一个开源的flask应用程序-它运行得很好。我改变了一件事 .scss 文件和整个应用程序无法加载。
我把所有的变化都解开了，但什么也没变。我不能再启动我的应用程序了。
每次我跑的时候 honcho start -f Local 并导航到 localhost:5000/ 我得到这个错误 webassets.exceptions.FilterError: Program file not found: sass 这是我终端上的跟踪记录
(venv) pcowe@Pauls-MacBook-Pro maps4all % honcho start -f Local
22:33:06 system   | web.1 started (pid=71020)
22:33:06 system   | redis.1 started (pid=71019)
22:33:06 system   | worker.1 started (pid=71021)
22:33:06 redis.1  | 71019:C 12 Aug 2020 22:33:06.639 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
22:33:06 redis.1  | 71019:C 12 Aug 2020 22:33:06.639 # Redis version=6.0.1, bits=64, commit=00000000, modified=0, pid=71019, just started
22:33:06 redis.1  | 71019:C 12 Aug 2020 22:33:06.639 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
22:33:06 redis.1  | 71019:M 12 Aug 2020 22:33:06.640 * Increased maximum number of open files to 10032 (it was originally set to 2560).
22:33:06 redis.1  | 71019:M 12 Aug 2020 22:33:06.642 * Running mode=standalone, port=6379.
22:33:06 redis.1  | 71019:M 12 Aug 2020 22:33:06.642 # Server initialized
22:33:06 redis.1  | 71019:M 12 Aug 2020 22:33:06.643 * Loading RDB produced by version 6.0.1
22:33:06 redis.1  | 71019:M 12 Aug 2020 22:33:06.643 * RDB age 51 seconds
22:33:06 redis.1  | 71019:M 12 Aug 2020 22:33:06.643 * RDB memory usage when created 1.02 Mb
22:33:06 redis.1  | 71019:M 12 Aug 2020 22:33:06.643 * DB loaded from disk: 0.001 seconds
22:33:06 redis.1  | 71019:M 12 Aug 2020 22:33:06.644 * Ready to accept connections
22:33:07 worker.1 | /Users/pcowe/Desktop/maps4all/app/__init__.py:18: FlaskWTFDeprecationWarning: "flask_wtf.CsrfProtect" has been renamed to "CSRFProtect" and will be removed in 1.0.
22:33:07 web.1    | /Users/pcowe/Desktop/maps4all/app/__init__.py:18: FlaskWTFDeprecationWarning: "flask_wtf.CsrfProtect" has been renamed to "CSRFProtect" and will be removed in 1.0.
22:33:07 worker.1 |   csrf = CsrfProtect()
22:33:07 web.1    |   csrf = CsrfProtect()
22:33:07 web.1    | Importing environment from .env file
22:33:07 worker.1 | Importing environment from .env file
22:33:07 web.1    | /Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py:835: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
22:33:07 worker.1 | /Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py:835: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
22:33:07 web.1    |   'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
22:33:07 worker.1 |   'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
22:33:07 web.1    |  * Serving Flask app "app" (lazy loading)
22:33:07 web.1    |  * Environment: production
22:33:07 web.1    |    WARNING: This is a development server. Do not use it in a production deployment.
22:33:07 web.1    |    Use a production WSGI server instead.
22:33:07 web.1    |  * Debug mode: on
22:33:07 worker.1 | 22:33:07 Worker rq:worker:99d42a58c1404444877927353f16c549: started, version 1.3.0
22:33:07 worker.1 | 22:33:07***Listening on default...
22:33:07 web.1    |  * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
22:33:07 web.1    |  * Restarting with stat
22:33:08 web.1    | /Users/pcowe/Desktop/maps4all/app/__init__.py:18: FlaskWTFDeprecationWarning: "flask_wtf.CsrfProtect" has been renamed to "CSRFProtect" and will be removed in 1.0.
22:33:08 web.1    |   csrf = CsrfProtect()
22:33:08 web.1    | /Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask_sqlalchemy/__init__.py:835: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
22:33:08 web.1    |   'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
22:33:08 web.1    |  * Debugger is active!
22:33:08 web.1    |  * Debugger PIN: 314-175-405
22:33:45 web.1    | 127.0.0.1 - - [12/Aug/2020 22:33:45] "GET / HTTP/1.1" 500 -
22:33:45 web.1    | Traceback (most recent call last):
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/filter/__init__.py", line 518, in subprocess
22:33:45 web.1    |     shell=os.name == 'nt')
22:33:45 web.1    |   File "/Users/pcowe/opt/anaconda3/lib/python3.7/subprocess.py", line 775, in __init__
22:33:45 web.1    |     restore_signals, start_new_session)
22:33:45 web.1    |   File "/Users/pcowe/opt/anaconda3/lib/python3.7/subprocess.py", line 1522, in _execute_child
22:33:45 web.1    |     raise child_exception_type(errno_num, err_msg, err_filename)
22:33:45 web.1    | FileNotFoundError: [Errno 2] No such file or directory: 'sass': 'sass'
22:33:45 web.1    | 
22:33:45 web.1    | During handling of the above exception, another exception occurred:
22:33:45 web.1    | 
22:33:45 web.1    | Traceback (most recent call last):
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/app.py", line 2464, in __call__
22:33:45 web.1    |     return self.wsgi_app(environ, start_response)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/app.py", line 2450, in wsgi_app
22:33:45 web.1    |     response = self.handle_exception(e)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/app.py", line 1867, in handle_exception
22:33:45 web.1    |     reraise(exc_type, exc_value, tb)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
22:33:45 web.1    |     raise value
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/app.py", line 2447, in wsgi_app
22:33:45 web.1    |     response = self.full_dispatch_request()
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/app.py", line 1952, in full_dispatch_request
22:33:45 web.1    |     rv = self.handle_user_exception(e)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception
22:33:45 web.1    |     reraise(exc_type, exc_value, tb)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
22:33:45 web.1    |     raise value
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
22:33:45 web.1    |     rv = self.dispatch_request()
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
22:33:45 web.1    |     return self.view_functions[rule.endpoint](**req.view_args)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/app/main/views.py", line 68, in index
22:33:45 web.1    |     modal=modal_attributes))
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/templating.py", line 140, in render_template
22:33:45 web.1    |     ctx.app,
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/flask/templating.py", line 120, in _render
22:33:45 web.1    |     rv = template.render(context)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/jinja2/environment.py", line 1090, in render
22:33:45 web.1    |     self.environment.handle_exception()
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/jinja2/environment.py", line 832, in handle_exception
22:33:45 web.1    |     reraise(*rewrite_traceback_stack(source=source))
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/jinja2/_compat.py", line 28, in reraise
22:33:45 web.1    |     raise value.with_traceback(tb)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/app/templates/main/index.html", line 1, in top-level template code
22:33:45 web.1    |     {% extends 'layouts/base.html' %}
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/app/templates/layouts/base.html", line 5, in top-level template code
22:33:45 web.1    |     {% include 'partials/_head.html' %}
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/app/templates/partials/_head.html", line 8, in top-level template code
22:33:45 web.1    |     {% assets 'app_css' %}<link rel="stylesheet" type="text/css" href="{{ ASSET_URL }}">{% endassets %}
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/ext/jinja2.py", line 187, in _render_assets
22:33:45 web.1    |     urls = bundle.urls(calculate_sri=True)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/bundle.py", line 833, in urls
22:33:45 web.1    |     urls.extend(bundle._urls(new_ctx, extra_filters, *args,**kwargs))
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/bundle.py", line 768, in _urls
22:33:45 web.1    |     *args,**kwargs)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/bundle.py", line 620, in _build
22:33:45 web.1    |     force, disable_cache=disable_cache, extra_filters=extra_filters)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/bundle.py", line 544, in _merge_and_apply
22:33:45 web.1    |     kwargs=item_data)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/merge.py", line 280, in apply
22:33:45 web.1    |     return self._wrap_cache(key, func)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/merge.py", line 222, in _wrap_cache
22:33:45 web.1    |     content = func().getvalue()
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/merge.py", line 255, in func
22:33:45 web.1    |     getattr(filter, type)(data, out,**kwargs_final)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/filter/sass.py", line 148, in input
22:33:45 web.1    |     self._apply_sass(_in, out, os.path.dirname(source_path))
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/filter/sass.py", line 142, in _apply_sass
22:33:45 web.1    |     return self.subprocess(args, out, _in, cwd=child_cwd)
22:33:45 web.1    |   File "/Users/pcowe/Desktop/maps4all/venv/lib/python3.7/site-packages/webassets/filter/__init__.py", line 520, in subprocess
22:33:45 web.1    |     raise FilterError('Program file not found: %s.' % argv[0])
22:33:45 web.1    | webassets.exceptions.FilterError: Program file not found: sass.
22:33:45 web.1    | 127.0.0.1 - - [12/Aug/2020 22:33:45] "GET /?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
22:33:45 web.1    | 127.0.0.1 - - [12/Aug/2020 22:33:45] "GET /?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -
22:33:45 web.1    | 127.0.0.1 - - [12/Aug/2020 22:33:45] "GET /?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
22:33:45 web.1    | 127.0.0.1 - - [12/Aug/2020 22:33:45] "GET /?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
22:33:45 web.1    | 127.0.0.1 - - [12/Aug/2020 22:33:45] "GET /?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -
请帮忙，我怎么解决这个问题？
如何修复webassets.exceptions.filterror:找不到程序文件：sass

暂无答案！

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