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You are most likely using an old version of mInstaller (one that is no longer compatible with our servers).
Please close the app (either via CMD+Q or using the Activity Monitor), delete from your Applications folder (be sure to also delete all other existing copies), empty your trash(!) and download the latest version:
Do not launch it yet though and instead, go to your Applications folder, press and hold the CMD+Option(Alt) keys, double-click mInstaller.app and, when asked to, delete the app's preferences.
Finally, try logging in onto mInstaller and the problem should be gone.