Недопустимый объединенный словарь. Либо ResourceDictionary помещается в собственное семейство MergedDictionaries, либо он добавляется в одно и то же семейство MergedDictionary дважды.

Message in Russian (Русский)

Unlocalized message

The merged dictionary is invalid. Either a ResourceDictionary is being placed into its own MergedDictionaries collection or a it is being added to the same MergedDictionary collection twice.

Search by Google

Available localized messages

Finnish (suomi) French (Français) German (Deutsch) Greek (Ελληνικά) Hebrew (עברית) Hungarian (magyar) Italian (Italiano) Japanese (日本語) Prior (Message) Korean (한국어) Norwegian (Bokmal) (Norsk (Bokmål)) Polish (Polski) Spanish (Español) Swedish (Svenska) Turkish (Türkçe) Arabic (العربية) Chinese (Simplified) (中文(简体)) Chinese (Traditional) (中文（繁體）) Next (Message) Czech (Čeština) Danish (Dansk) Dutch (Nederlands) Chinese (Simplified) (中文(简体)) Chinese (Traditional) (中文（繁體）) Portuguese (Brazil) (Português (Brasil))