The sentence contains a subject-verb agreement error. The subject 'areas' is plural, which requires the verb to be in the plural form. The verb 'has' is singular and does not agree with the plural subject. Therefore, the correct form should be 'have been' to match the plural subject 'areas'. In this context, 'has been' is incorrect because it implies a singular subject. The present perfect tense is formed with 'have' or 'has' plus the past participle, and since 'areas' is plural, 'have' should be used.