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Why does the RTX51_full can not work?

In the uvision2,I simulate it,It can work. 
but I load to the target(T89C51RD2&P89C668), 
It can not work.why? 
C51 vision is 7.01. 
RTX51 vision is 5.1. 
 
Here is the built info. 
 
Build target 'Target 1' 
compiling main.c... 
assembling rtxconf.a51... 
linking... 
Program Size: data=70.0 xdata=1037 code=7077 
"tt" - 0 Error(s), 0 Warning(s). 
 
 
Here is the source. 
 
#include <rtx51.h> 
#include <stdio.h> 
 
#define P1_0_BLINKER_TASK 1 
#define P1_1_BLINKER_TASK 2 
#define STARTUP_TASK 0 
 
sbit P1_0 = 0x90; 
sbit P1_1 = 0x91; 
//----------------------------------------------- 
void task0 (void) _task_ P1_0_BLINKER_TASK _priority_ 0 
{ 
while (1) 
{ 
P1_0 = 1; 
os_wait (K_TMO, 100, NULL); 
 
P1_0 = 0; 
os_wait (K_TMO, 100, NULL); 
} 
} 
//----------------------------------------------- 
void task1 (void) _task_ P1_1_BLINKER_TASK _priority_ 0 
{ 
while (1) 
{ 
P1_1 = 1; 
os_wait (K_TMO, 75, NULL); 
 
P1_1 = 0; 
os_wait (K_TMO, 75, NULL); 
} 
} 
//----------------------------------------------- 
void task2 (void) _task_ STARTUP_TASK 
{ 
os_set_slice (1000); /* set for OSC Frequency / 10,000 */ 
 
os_create_task (P1_0_BLINKER_TASK); 
os_create_task (P1_1_BLINKER_TASK); 
 
os_delete_task (os_running_task_id ()); 
} 
//----------------------------------------------- 
void main (void) 
{ 
os_start_system (STARTUP_TASK); 
}