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I'm not showing messages_macro as an outdated template for 2.0.11. Can you import a fresh copy of Omni and see if it's outdated for you?
Assuming you didn't make any changes to it, try hitting SAVE AND EXIT.
If that doesn't work, you need to make a change in the template, like adding a space anywhere in the template and hitting SAVE AND EXIT.
There's a bug on XF with outdated templates, I've reported it in the past and it's still outstanding.