红黑树 - FixItUp方法（用于旋转）

Question

我遇到了这个奇怪的错误。基本上我从书中找到了一些伪代码，并决定在我的红黑树中实现这个功能。 这是代码：

void InsertFixtUp(Node<Key,Item> * z)
{
    Node<Key,Item> * y = 0;
    if(z->parent != 0)
    {
    while (z->parent->colour==RED){ // first Error here
        if (z->parent==z->parent->parent->left){
            y=z->parent->parent->right;
            if(y->colour==RED) {
                //Case 1
                z->parent->colour = BLACK;
                y->colour=BLACK;
                z->parent->parent->colour=RED;
                z = z->parent->parent;
            } else if (z==z->parent->right){
                //Case 2
                z=z->parent;
                RotateLeft(z);
            }
            //Case 3
            z->parent->colour=BLACK;
            z->parent->parent->colour=RED;
            RotateRight(z->parent->parent);
        } else if (z->parent==z->parent->parent->right){
            y=z->parent->parent->left;
            if(y->colour==RED) {
                //Case 1
                z->parent->colour = BLACK;
                y->colour=BLACK;
                z->parent->parent->colour=RED;
                z = z->parent->parent;
            } else if (z==z->parent->left){
                //Case 2
                z=z->parent;
                RotateRight(z);
            }
            //Case 3
            z->parent->colour=BLACK;
            z->parent->parent->colour=RED;
            RotateLeft(z->parent->parent);
        }
    }
    root->colour=BLACK;
    }
}

第一个while循环中列表中的第一个错误是expected ‘)’ before ‘;’ token。这个错误是什么意思？