RTL L6218E: Undefined symbol

Hi, I encounter the following issue during compilation of my real-time test example

uv3Test.axf: Error: L6218E: Undefined symbol os_active_TCB (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_alloc_TCB (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_free_TCB (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_idle_demon (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_init_context (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_init_mem (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_maxtaskrun (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_tmr_init (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol tsk_lock (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol tsk_unlock (referred from rt_task.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_chk_robin (referred from rt_clock.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_tmr_force_irq (referred from rt_clock.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_tmr_inspect_cnt (referred from rt_clock.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_tmr_inspect_ovf (referred from rt_clock.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_tmr_reload (referred from rt_clock.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_clock_interrupt0 (referred from IRQ_RTX.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_alloc_TMR (referred from rt_timer.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_free_TMR (referred from rt_timer.o).
uv3Test.axf: Error: L6218E: Undefined symbol os_tmr_call (referred from rt_timer.o).

My main.c is as followed:

#include <RTL.h>

OS_TID id1, id2;

void task1(void) __task;

void task2(void) __task;

void task1(void) __task

{
}

void task2(void) __task

{
}

int main(void)

{
        os_sys_init(task1);
        return 0;

}

My retarget.c is as followed:

#include <rt_misc.h>

#pragma import(__use_no_semihosting_swi)

void _sys_exit(int return_code) {
label:  goto label;  /* endless loop */
}

I have set my ARM Development Tools to use RealView compiler and pointed to D:\Keil uv3\ARM\BIN30\

The RTL verison that I am usign is "RTL-ARM Version 3.02b Release"

My linker control string is as followed:

*.o "D:\Keil uv3\ARM\RV30\LIB\RTLRTX.LIB" --strict --map --xref --callgraph --symbols
--info sizes --info totals --info unused --info veneers
 --list ".\uv3Test.map"
-o "uv3Test.axf"

My hardware platform is Atmel SAM7S256

Thanks in advanced for anybody who provides comments. :-)