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I did the same thing as Johnclark1102 a few minutes ago and it worked fine as it always has, though some of my clan members (with the EXACT SAME MODS) get the error.
Unless there is some sort of magical "Enable Mods" toggle button we are all missing. I'm in the same clan and getting the same issue. Also, to answer your question Kingsly, Yes. We are using Free Mode.