Makefile fails to build kernel module "recipe commences before first target" - c

Question

I tried to build example 2.1 from https://www.tldp.org/LDP/lkmpg/2.6/lkmpg.pdf.
I tried googling for answers and all related threads came down on the Makefile being copied over wrong. So i tried retyping the makefile and i also tried other peoples Makefile. But i keep getting the same errors.
lkm.c:
#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_INFO */
int init_module(void)
{
printk(KERN_INFO "Hello world 1.\n");
return 0;
}
void cleanup_module(void)
{
printk(KERN_INFO "Goodbye world 1.\n");
}
Makefile:
obj-m += lkm.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
This is the error i get:
philip#ubuntu:~/test$ make
make -C /lib/modules/5.0.0-20-generic/build M=/home/philip/test modules
make[1]: Entering directory '/usr/src/linux-headers-5.0.0-20-generic'
make[2]: *** No rule to make target '/home/philip/test/lkm.c', needed by '/home/philip/test/lkm.o'. Stop.
make[1]: *** [Makefile:1605: _module_/home/philip/test] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.0.0-20-generic'
make: *** [Makefile:4: all] Error 2

Answer 1

Solved! The file in my directory was called lkm instead of lkm.c. Thanks for the replies :)