Unable to build packages for kernel modules

I followed the guide to Creating packages for kernel modules

Created Makefile:

include $(TOPDIR)/rules.mk
  2 include $(INCLUDE_DIR)/kernel.mk
  3 
  4 PKG_NAME:=Khelloworld
  5 PKG_VERSION:=1.0
  6 PKG_RELEASE:=1
  7 
  8 PKG_BUILD_DIR:=$(KERNEL_BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
  9 
 10 obj-m +=helloK.o
 11 KDIR:=/lib/modules/5.4.0-122-generic/build
 12 SOURCE_DIR:=/home/shouvik/openwrt/package/Khelloworld/src
 13 
 14 include $(INCLUDE_DIR)/package.mk
 15 
 16 #
 17 define KernelPackage/Khelloworld
 18     SECTION:=examples
 19     CATEGORY:=Examples
 20     TITLE:=Hello, World! from Kernel
 21 endef
 22 
 23 #
 24 define KernelPackage/Khelloworld/description
 25     A simple "Hello, World!" -application.
 26 endef
 27 
 28 #
 29 define Build/Prepare
 30     mkdir -p $(PKG_BUILD_DIR)
 31     cp $(SOURCE_DIR)/* $(PKG_BUILD_DIR)
 32     $(Build/Patch)
 33 endef
 34 
 35 #
 36 define Build/Compile
 37    $(MAKE) -C $(KDIR) M=$(shell pwd) modules
 38 endef
 39 
 40 #
 41 define KernelPackage/Khelloworld/install
 42     $(INSTALL_DIR) $(1)/etc/init.d
 43     $(INSTALL_DIR) $(1)/lib/modules/$(LINUX_VERSION)
 44     $(INSTALL_DIR) $(1)/usr/bin
 45     $(INSTALL_BIN) $(PKG_BUILD_DIR)/Khelloworld $(1)/usr/bin
 46 endef
 47 
 48 $(eval $(call KernelPackage,Khelloworld))

Errors I get

make[3]: Entering directory '/usr/src/linux-headers-5.4.0-122-generic'
make[4]: *** No rule to make target '/home/shouvik/openwrt/package/Khelloworld/helloK.o', needed by '__build'.  Stop.
Makefile:1762: recipe for target '/home/shouvik/openwrt/package/Khelloworld' failed
make[3]: *** [/home/shouvik/openwrt/package/Khelloworld] Error 2
make[3]: Leaving directory '/usr/src/linux-headers-5.4.0-122-generic'
Makefile:48: recipe for target '/home/shouvik/openwrt/build_dir/target-mips_24kc_musl/linux-ath79_tiny/Khelloworld-1.0/.built' failed
make[2]: *** [/home/shouvik/openwrt/build_dir/target-mips_24kc_musl/linux-ath79_tiny/Khelloworld-1.0/.built] Error 2
make[2]: Leaving directory '/home/shouvik/openwrt/package/Khelloworld'
time: package/Khelloworld/compile#1.51#0.49#1.98
    ERROR: package/Khelloworld failed to build.
package/Makefile:114: recipe for target 'package/Khelloworld/compile' failed
make[1]: *** [package/Khelloworld/compile] Error 1
make[1]: Leaving directory '/home/shouvik/openwrt'
/home/shouvik/openwrt/include/toplevel.mk:228: recipe for target 'package/Khelloworld/compile' failed
make: *** [package/Khelloworld/compile] Error 2

What i am missing to add in Makefile ?