我试图在ubuntu中运行rq worker，但是当我输入

rq worker

它给了我这个错误

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/rq/utils.py", line 169, in utcparse
    return datetime.datetime.strptime(string, _TIMESTAMP_FORMAT)
  File "/usr/lib/python3.8/_strptime.py", line 568, in _strptime_datetime
    tt, fraction, gmtoff_fraction = _strptime(data_string, format)
  File "/usr/lib/python3.8/_strptime.py", line 349, in _strptime
    raise ValueError("time data %r does not match format %r" %
ValueError: time data '' does not match format '%Y-%m-%dT%H:%M:%S.%fZ'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/rq/worker.py", line 508, in work
    result = self.dequeue_job_and_maintain_ttl(timeout)
  File "/usr/lib/python3/dist-packages/rq/worker.py", line 574, in dequeue_job_and_maintain_ttl
    result = self.queue_class.dequeue_any(self.queues, timeout,
  File "/usr/lib/python3/dist-packages/rq/queue.py", line 539, in dequeue_any
    job = job_class.fetch(job_id, connection=connection)
  File "/usr/lib/python3/dist-packages/rq/job.py", line 303, in fetch
    job.refresh()
  File "/usr/lib/python3/dist-packages/rq/job.py", line 515, in refresh
    self.restore(data)
  File "/usr/lib/python3/dist-packages/rq/job.py", line 478, in restore
    self.started_at = str_to_date(obj.get('started_at'))

我正在从另一个文件www.example.com排队一个简单的任务hello.py，代码：

def add(x, y):
    return x + y

这是我的main.py代码

from flask import Flask
from redis import Redis

from hello import add
from rq import Queue

q = Queue(connection=Redis())

app = Flask(__name__)

@app.route("/")
def hello():
    q.enqueue(add, 3, 7)
    return "Task enqueued"

if __name__ == "__main__":
    app.run(debug=True)

它在redis-server中排队，但是它没有一个工作者来运行，我只想要一个在ubuntu中运行的工作者。而且redis-server是本地托管的。我检查了任务是否正确排队，但是显示它们是0个工作者。我不知道还能写什么，但是可以随时问关于这个的任何问题。