I have the same issue also,the themer crew are aware of this and as far as I am aware are looking into it
Cool thanks for the headsup!
Just want to update that this happened to me too when using CloudMagic app (I could select only one of my gmail accounts in the widget settings).
Phone: Samsung Galaxy S4
Using normal email client on phone with Apple iCloud email address, when having phone themed with a theme that using notifications on the start screen it says Invalid Account.
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