Issue compiling Kernel Module

[arunkr.linux@gmail.com (Arun M Kumar)]

I have recently started with Device Drivers in Linux and have made a 
simple Hello world module.

My code is this
//---------------------------------------------------------
/* My first kernel Module */

#include <linux/init.h>
#include <linux/module.h>

static init my_init(void){
         printk(KERN_ALERT "Hello World\n");
         return 0;
}

static void my_exit(void){
         printk(KERN_ALERT "asta la vista baby\n");
}

MODULE_LICENSE("GPL");
module_init(my_init);
module_exit(my_exit);
//-------------------------------------------------------------


and the makefile i am using is like this...
//-------------------------------------------------------------
all:
         make -C /home/arun/Linux_Source M=`pwd`

clean:
         make -C /home/arun/Linux_Source M=`pwd` clean

obj-m := Hello_World.o
//---------------------------------------------------------------------

I receive the following error on running "$make"

//---------------------------------------------------------
make -C /home/arun/Linux_Source M=`pwd`
make[1]: Entering directory `/home/arun/Linux_Source'

   ERROR: Kernel configuration is invalid.
          include/generated/autoconf.h or include/config/auto.conf are 
missing.
          Run 'make oldconfig && make prepare' on kernel src to fix it.

make[1]: *** No rule to make target `Device'.  Stop.
make[1]: Leaving directory `/home/arun/Linux_Source'
make: *** [all] Error 2
//----------------------------------------------------------



PS:
The kernel Source i am using is a Copy of my Git Repository and is a 
copy of the branch 3.10.25.

my system details are:
Linux linux-nwya.site 3.10.25-2.10-desktop #2 SMP PREEMPT Tue Jan 7 
00:25:03 IST 2014 i686 i686 i386 GNU/Linux