make: No targets. Stop - makefile

Question

make is working strangely on my Makefile. It gives error "No targets. Stop". When I write make clean, it writes: "No rule to make target clean."
If i compile each file separately everything is fine.
Below is the code:
CC = g++
CFLAGS = -g -Wall
BOOSTIP = -I path/to/boost
default: abc
all: abc
abc: main.o node.o network.o my_funs.o my_random.o
$(CC) $(CFLAGS) $(BOOSTIP) main.o node.o network.o my_funs.o my_random.o -o abc
main.o: main.cpp node.hpp network.hpp
$(CC) $(CFLAGS) $(BOOSTIP) main.cpp -o main.o
node.o: node.cpp node.hpp my_funs.hpp my_random.hpp
$(CC) $(CFLAGS) $(BOOSTIP) node.cpp -o node.o
network.o: network.cpp network.hpp node.hpp my_funs.hpp my_random.hpp
$(CC) $(CFLAGS) $(BOOSTIP) network.cpp -o network.o
my_funs.o: my_funs.cpp my_funs.hpp node.hpp my_random.hpp
$(CC) $(CFLAGS) $(BOOSTIP) my_funs.cpp -o my_funs.o
my_random.o: my_random.cpp my_random.hpp
$(CC) $(CFLAGS) $(BOOSTIP) my_random.cpp -o my_random.o
clean:
rm abc *.o *~

Answer 1

The error was due to bad line ending. Makefile had only CR, as it should have LF.
Correcting it solved the problem.

Answer 2

I got this error several times and in many of these cases the error was very simple, some space left after the value attributed to a variable, for an instance in make book where book: was the label of a sequence to LaTeX my book "name" in the attribution field have written "text=name ". Solution: "text=name" no spaces left behind name. Now I do define variables putting the sign of comment just at the end
to prevent this error: "text=name##"