Undefined symbol assert_param (referred from misc.o).

Please somebody help me?

I am trying to write simple led code but ı got error build output is 

Build started: Project: Proje
*** Using Compiler 'V5.06 update 6 (build 750)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'
Build target 'Target 1'
linking...
.\Objects\Proje.axf: Error: L6218E: Undefined symbol assert_param (referred from misc.o).
Not enough information to list image symbols.
Not enough information to list load addresses in the image map.
Finished: 2 information, 0 warning and 1 error messages.
".\Objects\Proje.axf" - 1 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed: 00:00:00

---------------

and my code is:

#include "stm32f4xx.h" // Device header
#include "stm32f4xx_gpio.h" // Keil::Device:StdPeriph Drivers:GPIO
#include "stm32f4xx_rcc.h" // Keil::Device:StdPeriph Drivers:RCC

int main(){

GPIO_InitTypeDef GPIO_InitStructure; //Configurations hiding below the structure of TypeDef
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15 ;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOD,&GPIO_InitStructure);

GPIO_SetBits(GPIOD,GPIO_Pin_12);
GPIO_SetBits(GPIOD,GPIO_Pin_13);
GPIO_SetBits(GPIOD,GPIO_Pin_14);
GPIO_ResetBits(GPIOD,GPIO_Pin_15);

}

More questions in this forum