c++ makfile error: makefile:5: *** missing separator. Stop - linux

Question

I'm trying to run my c++ (written in clion) program in linux. When I try to compile it in the terminal using "make" command, I get this error:
"makefile:5: *** missing separator. Stop."
I already checked that there tabs and not 4 spaces in my makefile.
Anyone has an idea?
Thanks!
This is my makefile:
CFLAGS := -c -Wall -Weffc++ -g -std=c++11 -Iinclude
LDFLAGS := -lboost_system
all: StompBookClubClient
g++ -pthread -o bin/StompBookClubClient bin/ConnectionHandler.o bin/Book.o bin/keyboardInputSend.o bin/socketReader.o bin/User.o $(LDFLAGS)
StompBookClubClient: bin/StompBookClubClient bin/ConnectionHandler.o bin/Book.o bin/keyboardInputSend.o bin/socketReader.o bin/User.o
bin/Book.o: src/Stomp/Book.cpp
g++ -pthread $(CFLAGS) -o bin/Book.o src/Book.cpp
bin/ConnectionHandler.o: src/Stomp/ConnectionHandler.cpp
g++ -pthread $(CFLAGS) -o bin/ConnectionHandler.o src/ConnectionHandler.cpp
bin/keyboardInputSend.o: src/Stomp/keyboardInputSend.cpp
g++ -pthread $(CFLAGS) -o bin/keyboardInputSend.o src/keyboardInputSend.cpp
bin/socketReader.o: src/Stomp/socketReader.cpp
g++ -pthread $(CFLAGS) -o bin/socketReader.o src/socketReader.cpp
bin/StompBookClubClient.o: src/Stomp/StompBookClubClient.cpp
g++ -pthread $(CFLAGS) -o bin/StompBookClubClient.o src/StompBookClubClient.cpp
bin/User.o: src/Stomp/User.cpp
g++ -pthread $(CFLAGS) -o bin/User.o src/User.cpp
.PHONY: clean
clean:
rm -f bin/*

Answer 1

I already checked that there tabs and not 4 spaces in my makefile.
Check it a bit harder. The Makefile you pasted here has 4 spaces on line 5 and produces exactly the error you are seeing. If I replace them by a tab, the next error occurs on line 10, and so on.

Answer 2

This is not an answer but I do not have sufficient points to comment and hence answering.
Apart from 'tab' issue ,you get a similar error if ':'(colon) is missed after the rule name.
Ex makefile:
helloworld.o
g++ helloworld.cc -o helloworld.o;
Error:
Makefile:1: *** missing separator. Stop.
Solution:
Colon after helloworld.o like below
helloworld.o:
g++ helloworld.cc -o helloworld.o;