What does the error message "Trying to get property of non-object" mean in the context of a Laravel hasMany relation?

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The error message "Trying to get property of non-object" in the context of a Laravel hasMany relation usually means that the relation is not set or is null, and therefore cannot be accessed. This can happen if the relation has not been properly defined or if there are no records in the related table that match the criteria specified in the query. To resolve this error, check the relation definition and ensure that the related table has records that match the query criteria.