QT ERROR : at least one valid and enabled repository required for this action to succeed qt

1) open qt maintain tool
2)settings
3)Add new user defined repository
4)Repositories

Mac: http://ftp2.nluug.nl/languages/qt/online/qt5/mac/x64/online_repository
Windows: http://ftp2.nluug.nl/languages/qt/online/qt5/windows/x86/online_repository
Linux: http://ftp2.nluug.nl/languages/qt/online/qt5/linux/x86/online_repository