MKDocs Can't make document

I will use MKDocs to make the document but it says:

Error: MkDocs encountered an error parsing the configuration file: mapping values are not allowed here
  in "/home/phao/桌面/python/Bayesian/mkdocs.yml", line 4, column 15

I had pushed the contents in github commit e8221fc1f0402834b6db92280e67e9fcac4a2b10 in Commits on Oct 23, 2022. How can I finish it? Why it failed?

P.S. This is /home/phao/桌面/python/Bayesian/mkdocs.yml:

site_name: Bayesian v0.1 Documentation
plugins:
  - mkdocstrings
      handlers:
          python:
            setup_commands:
              - import sys
              - sys.path.insert(0, "..")

And this is the issue in Github.

This is yaml format error. Correct format like this:

site_name: Bayesian v0.1 Documentation
plugins:
  - mkdocstrings:
      handlers:
          python:
            setup_commands:
              - import sys
              - sys.path.insert(0, "..")