I use default config, and the plugin issue a error?

[darkread]

I use the default config
When I press ctrl+shift+v to insert a image in md file, it worked, but
the plugin issue a error like this
"The Ftp config pasteImage.ftp* is invalid. please check your config."
My config like below, and I want to save picture in the subdir, and it do it right ,but it issue the error every time ,can you help me ?

  "pasteImageFtp.path": "${currentFileDir}",

  // The base path of image url.You can use variable ${currentFileDir} and ${projectRoot}. ${currentFileDir} will be replace by the path of directory that contain current editing file. ${projectRoot} will be replace by path of the project opened in vscode. If you set basePath to empty String, it will insert absolute path to file.
  "pasteImageFtp.basePath": "${currentFileDir}",

  // Force set the file separator styel to unix style. If set false, separator styel will follow the system style.
  "pasteImageFtp.forceUnixStyleSeparator": true,

  // The string prepend to the resolved image path before paste.
  "pasteImageFtp.prefix": "",

  // The string append to the resolved image path before paste.
  "pasteImageFtp.suffix": "",

  // ftp server address
  "pasteImageFtp.ftpHost": "",

  // ftp server username
  "pasteImageFtp.ftpUserName": "",

  // ftp server user password
  "pasteImageFtp.ftpUserPwd": "",

  // ftp server port
  "pasteImageFtp.ftpPort": 21,

  // ftp server file saved folder
  "pasteImageFtp.ftpFolder": "",

  // static web server for images
  "pasteImageFtp.staticSitePort": 80,

  // local images saved path
  "pasteImageFtp.localPath": "images",```