C++ - 錯誤C4430：缺少類型說明符（對於構造函數???）

自從昨晚我一直堅持使用它，對於我的生活，我一直無法弄清楚爲什麼會發生這種情況。我必須錯過一些非常簡單的事情。C++ - 錯誤C4430：缺少類型說明符（對於構造函數???）

我正在製作一個OpenGL程序。在這個程序中，我正在製作一個DialogBox類。下面是代碼：

//--------------------------------------------------------------- 
//DialogBox.h 
//--------------------------------------------------------------- 

#include <vector> 

class DialogBox 
{ 
    private: 

     float X; float Y; float Z; 
     float Width; 
     float Height; 

     float RED; 
     float GREEN; 
     float BLUE; 
     float ALPHA; 

     int currentLine; 
     int maxLines; //How many lines of text this dialog box can hold 
     int maxChars; //How many chars each line of text can hold 

     std::vector< std::vector<char> >Text; //Text contents of the Dialog Box 

     unsigned int vertexArray_DialogBox; 
     unsigned int vertexBuffer_DialogBox; 


    public: 

     DialogBox(); 
     DialogBox(float width, float height); 

     void draw(); 
     void draw(float x, float y, float z); 

}; 

//------------------------------------------------------------------------ 
//DialogBox.cpp 
//------------------------------------------------------------------------ 

#include <iostream> 
#include "DialogBox.h" 

DialogBox::DialogBox() 
{ 
    X = 0.0f; Y = 0.0f; Z = 0.0f; 

    Width = 1.0f; 
    Height = 1.0f; 

    RED = 0.0f; 
    GREEN = 1.0f; 
    BLUE = 1.0f; 
    ALPHA = 1.0f; 

    //For HELVETICA_18 ---------------------- 
    static const float letter_width = 0.03f; 
    static const float letter_height = 0.04f; 
    static const float line_height = 0.1f; 
    //--------------------------------------- 


    maxLines = Height/line_height - 4; 
    maxChars = Width/letter_width - 2; 

    Text.resize(maxLines); 
    for(int i = 0; i < maxLines; i++) 
    { 
     Text[i].resize(maxChars); 
    } 
} 

DialogBox::DialogBox(float width, float height) 
{ 
    Width = width; 
    Height = height; 
    //The rest of the initialization codes 
} 

void DialogBox::draw() 
{ 
    //OpenGL Drawing codes 
} 

void DialogBox::draw(float x, float y, float z) 
{ 
    X = x; Y = y; Z = z; 
    draw(); 
}

，編譯器拋出此錯誤消息：

enter image description here