Folders missing in SDK path selection window
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I have newly installed IntelliJ IDE and installed the Dart plugging too. Now in the SDK path selection window I can't find many folders which is in fact there;( I can see these files and folders through terminal or file manager) further to add the confusion in the path selection window I could see some folders which are no existent. 
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Click 'Refresh' button in the Select Dart SDK Path dialog.
Do you see this folder in other situation (such as open project, select Java SDK etc)?
Do you run IDE under a user in the sudoers group?