Problem to rename file

hi all master here.i wish to change this file name after download from:
[在一起.With.You.2020.E01.WEB-DL.4k.H265.AAC]
to
[在一起.With.You.S01E01.WEB-DL.4k.H265.AAC]

but i fail.
my config can download, but cannot change the file name.
anyone can help me ?

templates:
  tr:
    transmission:
      host: xx
      port: xx
      username: admin
      password: xx

tasks:
  HDSky-在一起:
      rss:xxxx
    seen:
      fields:
        - url
    regexp:
      accept:
        - HDSWEB
    template: tr
    set:
      path: /volume1/Media/陆剧
    content_size:
      min: 1000
      max: 4000
      strict: no
    manipulate:
    - filename:
        replace:
          regexp: '\b2020.\b'
          format: 'S01'

the error return is like this.

2020-10-03 01:34:33 CRITICAL manager                       [/tasks/HDSky-在一起-sort/filesystem/path] `/volume1/Media/陆剧/在一起.With.You.2020.WEB-DL.4k.H265.AAC-HDSWEB` does not exist

but this folder is actually exist.

can anyone help ?