Data Manager Permission Denied in Nova Launcher

A

AC Question

I use HTC One M8, AT&T, 4.4.2, not rooted.

As the title says, the data manager app that comes with the phone does work with nova launcher. It doesn't start and just give a permission denied, it works fine with the default launcher though.

Anyone got this problem too or can provide a solution ? or suggest a alternate data managing app ?
Thanks !