关于解析的时候出现内存的问题

下面的XML解析代码报出内存警告，不知道应该怎么解决，

if  ([elementName isEqualToString:@"page_details"])
    {
        IstructPageDetails *objIstructPageDetails = [[IstructPageDetails alloc] initwithIstructPageDetails:attributeDict];
        [m_objmuteArrOutput addObject:objIstructPageDetails];
        [objIstructPageDetails release];

    }

警告： Incorrect decrement of the reference count of an object that is not owned at this point by the caller