                        课程
                    
                        /移动开发
                        
                            /iOS
                        
                        /使用Swift开发iOS8 App实战

求哪位大神指点下，该怎么办

beautyGallery[1594:27177] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<beautyGallery.ViewController 0x7f946b4a3710> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key beautyPick.'

按照老师的步骤来出现来这个问题，求哪位做出来的大哥解释下，改怎么办呢