Can not log in, shows “登录失败”

**Describe the bug**
A clear and concise description of what the bug is.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- OS:
- Vim or Neovim:
- (Neo)vim version:

**Output channel:**

1. Set `"flutter.trace.server": "verbose"`
2. Reproduce the issue
3. `:CocList output` open output list and select `flutter`

Log:

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