SCHEMA_VALIDATION_FAILED - Without extra information?

[111757 (Стефан Јовановић)]

I’ve found the reason. Here’s my structure:

open class Quiz: RealmObject {
   ...
   var _id: ObjectId = ObjectId()
   var questions: RealmList<QuizQuestion> = realmListOf()
}

open class QuizQuestion: EmbeddedRealmObject {
   ...
   var codeExample: CodeExample = CodeExample()
}

open class CodeExample: EmbeddedRealmObject {
   ...
}

To fix the issue, I had to add codeExample as nullable type, with a null as a default value. Then the error disappeared. Hope it helps someone.

open class QuizQuestion: EmbeddedRealmObject {
   ...
   var codeExample: CodeExample? = null
}