Device Driver insmod error

[Adithya Baglody]

hi,

I am using a angstrom distro for BeagleBone Black. I have written a simple char DD but while inserting there is a error as 

root@beaglebone:/home/adi/myNUll# insmod mullchar.ko

Error: could not insert module nullchar.ko: Invalid parameters

when i run a dmesg i get

root@beaglebone:/home/adi/myNUll# dmesg |tail 
[ 6449.821628] nullchar: disagrees about version of symbol cdev_add

[ 6449.821653] nullchar: Unknown symbol cdev_add (err -22)

[ 6449.821671] nullchar: disagrees about version of symbol device_create

[ 6449.821681] nullchar: Unknown symbol device_create (err -22)

[ 6449.821706] nullchar: disagrees about version of symbol device_destroy

[ 6449.821715] nullchar: Unknown symbol device_destroy (err -22)

[ 6449.821730] nullchar: disagrees about version of symbol cdev_init

[ 6449.821739] nullchar: Unknown symbol cdev_init (err -22)

[ 6449.821748] nullchar: disagrees about version of symbol cdev_del

[ 6449.821757] nullchar: Unknown symbol cdev_del (err -22)

The vermagic using modinfo nullchar.ko

vermagic:       3.8.13 SMP mod_unload modversions ARMv7 thumb2 p2v8

root@beaglebone:/home/adi/myNUll# uname -a

Linux beaglebone 3.8.13 #1 SMP Tue Jun 18 02:11:09 EDT 2013 armv7l GNU/Linux

The code that i have written is 

#include<linux/init.h>

#include<linux/module.h>

#include<linux/version.h>

#include<linux/types.h>

#include<linux/fs.h>

#include<linux/device.h>

#include<linux/cdev.h>

#include<linux/kdev_t.h>

#include<linux/kernel.h>

#include<asm/uaccess.h>

MODULE_LICENSE("GPL");

MODULE_VERSION("0.1");

static dev_t first=MKDEV(0,0);

static struct cdev c_dev;

static struct class *cl;

static int my_open(struct inode *inode,struct file *filp)

{

        printk(KERN_INFO "driver is now open");

        return 0;

}

static int my_close(struct inode *inode,struct file *filp)

{

        printk(KERN_INFO "the driver is closed");

        return 0;

}

static ssize_t my_read(struct file *filp,char __user *buf,size_t len,loff_t *off)

{

        printk(KERN_INFO "the driver is reading");

        return 0;

}

static ssize_t my_write(struct file *filp,const char __user *buff ,size_t len,loff_t *off)

{

        printk(KERN_INFO "the driver is writing");

        return len;

}

static struct file_operations fops={

        .owner= THIS_MODULE,

        .open=my_open,

        .read=my_read,

        .write=my_write,

        .release=my_close,

};

static int __init my_init(void)

{

        printk(KERN_ALERT "Device Init running");

        if(alloc_chrdev_region(&first,0,1,"Simple_char_driver")<0)

        {       

                return -1;

        }

        if((cl=class_create(THIS_MODULE,"Simple_char_driver"))==NULL)

        {

                unregister_chrdev_region(first,1);

                return -1;

        }

        if(device_create(cl,NULL,first,NULL,"Simple_char_driver")==NULL)

        {

                class_destroy(cl);

                unregister_chrdev_region(first,1);

                return -1;

        }

cdev_init(&c_dev,&fops);

      c_dev.owner=THIS_MODULE;

      if(cdev_add(&c_dev,first,1)==-1)

      {

                device_destroy(cl,first);

                class_destroy(cl);

                unregister_chrdev_region(first,1);

return -1;

      }

        return 0;

}

static void __exit my_exit(void)

{

        cdev_del(&c_dev);

        device_destroy(cl,first);

        class_destroy(cl);

        unregister_chrdev_region(first,1);

        printk(KERN_INFO " driver running __exit");

}

module_init(my_init);

module_exit(my_exit);

MODULE_AUTHOR("ADITHYA");

MODULE_DESCRIPTION("Simple char driver");

I am unable to realize the problem in this.i need help to resovling this error.

Regards