Flutter 解决 No classes that inherit JsonConvert were found

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Flutter 解决 No classes that inherit JsonConvert were found:

  • If "No classes that inherit JsonConvert were found" is displayed, delete the ". Idea "directory under the project and click" invalidate Caches"in your (Andorid Studio or IDEA) button to restart the IDE
  • Two (and more)-dimensional array is not supported

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