Runtime Error Kodular

estoy realizando aun app de chat, pero al momento de seleccionar el contacto me da el error

Translation added by Mod, I am still making a chat app, but when selecting the contact it gives me the error

que puedo hacer.
estos son mis bloques

Translation added by Mod, What I can do.
these are my blocks





gracias de antemano

Please post in english. Community does not allow any other languages.

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