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I've upgraded to Vanilla 2.8 and I have debugging on locally. I see the notice:
Info Could not find file 'custom_default.css' in folder ''.
Searching the code, the only reference I found to this file was in it itself:
themes/keystone/design/custom_default.css:/*# sourceMappingURL=custom_default.css.map */
I do have a custom theme - I'm wondering if there is something I should be doing/fixing here?