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I get 4 of these these error messages on every page when using Consistent Language Interface module.
Notice: Array to string conversion in theme_languageswitcher() (line 247 of C:\wamp\www\annakasyan2013\sites\all\modules\languageinterface\languageinterface.module).
I realised that the problem is with Andromeda theme because as soon as I switch to another theme, these error messages disappear.