I am trying to remove someone who appears on the clan roster, when I click 'Kick' it asks me if I am sure. Then I say yes and it gives the error GrouMembership Not Found.
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You may be in a cached state, and thus you're still seeing that user. Clear your cache and cookies, and restart your browser. If they're still there, check their Bungie.net profile and click on their membership tab to see if they're still in your group.