Simple CMX RTOS task using ST10 Series Controller

[w_bwr]

RTOS : CMX
Compiler: Tasking
Controller: ST10F276


I have written a simple program to test RTOS. There is only one task which turns the LED off.

#include <regf276e.h> 
#include <cxfuncs.h>

#define T4_Trap 0x24

unsigned char ucLed1TaskSlot, ucLed2TaskSlot;
unsigned int uiTimerReload;

void Setup(void)
{
// Timer Setup
uiTimerReload = 0xE140;						// @64 Mhz we want the timer to fire every 1ms
T4IC = 0x0030;                             // T4 Interrupt Reserved and set elsewhere
T4 = uiTimerReload;
T4CON = 0x0040;
T4IE = 0;

// Leds Direction Registers
_putbit(1,DP3,9);
_putbit(1,DP3,15);

// Serial Comms
_bfld(DP3,0x0C00,0x0400);
_putbit(1,P3,10);

S0CON = 0x8011;
S0BG = 0x0067;					// baud rate 19200
S0TBIR =1;
}	


_interrupt(T4_Trap) _using (T4_RB) void T4_vector(void)
{	
K_OS_Tick_Update();
//S0TBUF = 'W';                         
T4 = uiTimerReload + T4;
K_OS_Intrp_Exit();                    
}

void LED1Task(void)
{
while (1)
	{
   	_putbit(0,P3,9);
	}
}



void SerialPrint(char *line)
{
	while(*line)
	{
		while (!S0TBIR) {}
		S0TBIR =0;

		S0TBUF = *line;
		line++;
	}

}

void main ()
{
unsigned char status;

Setup();
_putbit(1,P3,9);
_putbit(1,P3,15);
SerialPrint("Setup Completed\n");

K_OS_Init();
SerialPrint("OS Initialized\n");   // OS Initialized

status = K_Task_Create(0, &ucLed1TaskSlot, LED1Task, 128);
status &= K_Task_Start(ucLed1TaskSlot);


if (status == K_OK)
	{
   	SerialPrint("OS Started\n"); // OS Started;
	T4IE = 1;     // Timer Interrupt enabled

	K_OS_Start();
	}
else
	{
	_putbit(0,P3,15);
	}
}

The Problem is that the code doesn't run at all after K_OS_Init() instruction.
Neither the "OS Initialized" is sent nor the LED at pin 15 gets off. What could be the problem?