Build target 'LED-DEMO'
compiling app.c...
linking...
..\Output\STM32-DEMO.axf: Error: L6218E: Undefined symbol OSTaskReturnHook (referred from os_task.o).
..\Output\STM32-DEMO.axf: Error: L6218E: Undefined symbol OS_CPU_SysTickClkFreq (referred from os_cpu_c.o).
..\Output\STM32-DEMO.axf: Not enough information to list image symbols.
..\Output\STM32-DEMO.axf: Finished: 1 information, 0 warning and 2 error messages.
Target not created