bash: ./main: cannot execute binary file: Exec format error [closed] - c++

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I know this Question has been asked before, but none of the answers helped in my case.
I have Ubuntu 18.04 LTS installed and when I try to run my C++ program, I get this Error:
bash: ./main: cannot execute binary file: Exec format error
I know this error occurs, when a 32-bit program is tried to be run on a 64-bit machine. But using file main in the terminal outputs
main: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
and using uname -a outputs
Linux florian 4.15.0-46-generic #49-Ubuntu SMP Wed Feb 6 09:33:07 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
What do I overlook?
Thanks in advance
EDIT:
I compile the program using
g++ -Wall -c -std=c++14 -o main main.cpp
This is how the folder with the files looks like:
https://www.bilder-upload.eu/bild-cf6106-1553082433.png.html
The Game.h is included in the main.cpp, thats why i use the -c flag
Trying to compile the file without the -c flag gives me this terminal output:
/tmp/ccBqZfJw.o: In function `main':
main.cpp:(.text+0x63): undefined reference to `Sep::Game::Game()'
main.cpp:(.text+0xaf): undefined reference to `Sep::Game::loadConfig(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
main.cpp:(.text+0xec): undefined reference to `Sep::Game::printMap()'
main.cpp:(.text+0x102): undefined reference to `Sep::Game::addWorm(int, int)'
main.cpp:(.text+0x121): undefined reference to `Sep::Game::printMap()'
main.cpp:(.text+0x13c): undefined reference to `Sep::Game::move(int, int, int)'
main.cpp:(.text+0x152): undefined reference to `Sep::Game::addWorm(int, int)'
main.cpp:(.text+0x17b): undefined reference to `Sep::Game::addWorm(int, int)'
main.cpp:(.text+0x19a): undefined reference to `Sep::Game::printMap()'
main.cpp:(.text+0x1b5): undefined reference to `Sep::Game::move(int, int, int)'
main.cpp:(.text+0x1d0): undefined reference to `Sep::Game::move(int, int, int)'
main.cpp:(.text+0x1eb): undefined reference to `Sep::Game::move(int, int, int)'
main.cpp:(.text+0x1f7): undefined reference to `Sep::Game::printMap()'
main.cpp:(.text+0x20d): undefined reference to `Sep::Game::addWorm(int, int)'
main.cpp:(.text+0x233): undefined reference to `Sep::Game::addWorm(int, int)'
main.cpp:(.text+0x25e): undefined reference to `Sep::Game::move(int, int, int)'
main.cpp:(.text+0x26f): undefined reference to `Sep::Game::~Game()'
main.cpp:(.text+0x2b9): undefined reference to `Sep::Game::~Game()'
collect2: error: ld returned 1 exit status
EDIT:
After trying to compile it withe the other files at the ame time it seems like we're getting closer to a solution, but there are still some errors:
Command:
g++ -Wall -std=c++14 -o main main.cpp Field.cpp Game.cpp
Output:
/tmp/ccrCypxF.o: In function `main':
main.cpp:(.text+0x26f): undefined reference to `Sep::Game::~Game()'
main.cpp:(.text+0x2b9): undefined reference to `Sep::Game::~Game()'
/tmp/ccxLZpfi.o: In function `Sep::Game::Game()':
Game.cpp:(.text+0x1f): undefined reference to `vtable for Sep::Game'
/tmp/ccxLZpfi.o: In function `Sep::Game::printMap()':
Game.cpp:(.text+0x104e): undefined reference to `Sep::Field::Field()'
/tmp/ccxLZpfi.o: In function `Sep::Game::move(int, int, int)':
Game.cpp:(.text+0x133b): undefined reference to `Sep::Field::Field()'
collect2: error: ld returned 1 exit status

Answer 1

You should compile all files in the same command, so that they can be linked into an executable:
g++ -Wall -std=c++14 -o main main.cpp Field.cpp Game.cpp

Answer 2

Hi and welcome here on SO.
You should explain how you compile and link your program, as I'm afraid there's something wrong there.
The problem is your file is not an executable. As the file utility states, it is a relocatable file, not an executable.
To learn more about the difference between relocatables and executables you can have a look at this answer here on SO: What is the difference between executable and relocatable in elf format?
EDIT
Since the OP has provided more details, here is the solution.
1) Drop the -c flag. As others have stated, that is plain wrong there;
2) Add all the .cpp files in your compile command:
g++ -Wall -std=c++14 -o main main.cpp Field.cpp Game.cpp