请问用UCGUI建立的新窗口出现错误该怎么办？

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "tft.h"
#include "usart.h"
#include "gui.h"
#include "math.h"
#include "includes.h"
static void cbBackgroundWin(WM_MESSAGE* pMsg)
{
switch(pMsg->MsgId)
{
case WM_PAINT:  GUI_Clear();
default:   WM_DefaultProc(pMsg);
}
}
static void cbForegroundWin(WM_MESSAGE* pMsg)
{
switch(pMsg->MsgId)
{
case WM_PAINT:
     GUI_SetBkColor(GUI_GREEN);
GUI_Clear();
GUI_DispString("Foreground window");
break;
      default:
     WM_DefaultProc(pMsg);   
}
}
static void DemoRedraw(void)
{
GUI_HWIN hWnd;
while(1)
{
hWnd=WM_CreateWindow(10,10,100,100,WM_CF_SHOW,cbForegroundWin,0);
delay_us(1000);
WM_DeleteWindow(hWnd);
GUI_DispStringAt("Background of window has not been redraw",10,10);
delay_us(1000);
GUI_Clear;
WM_SetCallback(WM_HBKWIN,cbBackgroundWin);
hWnd=WM_CreateWindow(10,10,100,100,WM_CF_SHOW,cbForegroundWin,0);
delay_us(1000);
WM_DeleteWindow(hWnd);
delay_us(1000);
WM_SetCallBack(WM_HBKWIN,0);
}
}
void main(void)
{
    delay_init();
   NVIC_Configuration();
   uart_init(9600);
   GUI_Init();
   DemoRedraw();
}
编译后出现下面的错误！
Build target 'Template'
compiling main.c...
main.c(227): error:  #20: identifier "WM_MESSAGE" is undefined
main.c(229): error:  #132: expression must have pointer-to-struct-or-union type
main.c(231): error:  #20: identifier "WM_PAINT" is undefined
main.c(232): warning:  #223-D: function "WM_DefaultProc" declared implicitly
main.c(236): error:  #20: identifier "WM_MESSAGE" is undefined
main.c(238): error:  #132: expression must have pointer-to-struct-or-union type
main.c(240): error:  #20: identifier "WM_PAINT" is undefined
main.c(246): warning:  #223-D: function "WM_DefaultProc" declared implicitly
main.c(254): warning:  #223-D: function "WM_CreateWindow" declared implicitly
main.c(254): error:  #20: identifier "WM_CF_SHOW" is undefined
main.c(256): warning:  #223-D: function "WM_DeleteWindow" declared implicitly
main.c(259): warning:  #174-D: expression has no effect
main.c(260): warning:  #223-D: function "WM_SetCallback" declared implicitly
main.c(260): error:  #20: identifier "WM_HBKWIN" is undefined
main.c(265): warning:  #223-D: function "WM_SetCallBack" declared implicitly
main.c(270): warning:  #951-D: return type of function "main" must be "int"
Target not created
求高手帮帮忙额 ！