错误 - org.apache.http.entity.StringEntity。<init> </init>

Question

我正在使用Eclipse创建java项目。我收到以下错误，我不明白缺少什么。请帮忙

 Exception in thread "main" java.lang.NoSuchMethodError: org.apache.http.entity.StringEntity.<init>(Ljava/lang/String;Lorg/apache/http/entity/ContentType;)V
    at org.apache.http.client.fluent.Request.bodyString(Request.java:282)
    at com.urbanairship.api.client.APIClient.pushRequest(APIClient.java:113)
    at com.urbanairship.api.client.APIClient.push(APIClient.java:200)
    at MainClass.main(MainClass.java:76)