Property 'Gdatatext' not found on

[次大陆]

//错误信息：Property 'Gdatatext' not found on object of type 'ViewController *'
NSString *path = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"xml"];
NSData *data = [[NSData alloc]initWithContentsOfFile:path];
//对象初始化
GDataXMLDocument *doc = [[GDataXMLDocument alloc]initWithData:data error:nil];
//获取根节点
GDataXMLElement *rootElement = [doc rootElement];
//获取其他节点
NSArray *students = [rootElement elementsForName:@"student"];
//初始化可变数组，用来显示到textView
self.GDatatext = [[NSMutableString alloc]initWithString:@""];
for (GDataXMLElement *student in students) {
//获取节点属性
GDataXMLElement *pidElement = [[student elementsForName:@"pid"] objectAtIndex:0];
NSString *pid = [pidElement stringValue];


GDataXMLElement *nameElement = [[student elementsForName:@"name"] objectAtIndex:0];
NSString *name = [nameElement stringValue];


GDataXMLElement *sexElement = [[student elementsForName:@"sex"] objectAtIndex:0];
NSString *sex = [sexElement stringValue];


GDataXMLElement *ageElement = [[student elementsForName:@"age"] objectAtIndex:0];
NSString *age = [ageElement stringValue];

//调整一下姿势，添加到可变长字符串~~
NSString *t = [NSString stringWithFormat:@"学号：%@ 姓名：%@ 性别：%@ 年龄：%@\n", pid, name, sex, age];
[self.GDatatext appendString:t];
}
self.textView.text = self.GDatatext;