I want to validate these field from below the Json code- Language, Year of Experience, House Number, City, Country, Mobile, Current Address field value validation. But I am getting error

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I want to validate these field but I am getting error - Help - Postman

I want to validate r (Language, Year of Experience, House Number, City, Country, Mobile, Current Address) these field from the Json code. But I am getting error - Help - Postman