[Bug] import markdown error

[smartyhero]

Bug Description

When I imported the readme.md of the appflowy code repository into appflowy, nothing happened after I selected the file, and there was an error in the appflowy log.

How to Reproduce

Import the readme.md in the appflowy code repository into appflowy

Expected Behavior

Markdown files can be imported normally
Appflowy can display error messages when the import fails.

Operating System

mac

AppFlowy Version(s)

0.5.6

Screenshots

No response

Additional Context

No response