C++: Error occurs when fmt library is included - c++

Question

https://github.com/fmtlib/fmt
I'm having trouble using c++ library on ubuntu eclipse. I downloaded the fmt library from github. I followed the steps as described in the documentation section Building the Library. In fmt folder;
mkdir build # Create a directory to hold the build output.
cd build
cmake .. # Generate native build scripts.
After running the commands, makefiles are created in the build array.
To install the library I ran following command.
sudo make install
After the installation, the necessary files were copied to the /usr/local/ directory. I copied the header files and compiled libfmt.a file to my project directory.
My project hierarchy;
fmtTestProject
|--Debug
|--src
|--fmtTest.cpp
|--include
|--args.h
|--chrono.h
|--color.h
|--compile.h
|--core.h
|--format.h
|--format-inl.h
|--os.h
|--ostream.h
|--printf.h
|--ranges.h
|--std.h
|--xchar.h
|--lib
|--libfmt.a
I defined the include files to the eclipse project.
fmtTest -> Properties -> C/C++ Build -> Settings -> GCC C++ Compiler -> Includes -> Include paths -> "${workspace_loc:/${ProjName}/include}"
fmtTest -> Properties -> C/C++ Build -> Settings -> GCC C++ Linker -> Library search path -> "${workspace_loc:/${ProjName}/lib}"
After the define libraries, I wrote the code in the documentation and compiled it.
#include <fmt/core.h>
int main() {
fmt::print("Hello, world!\n");
}
The code compiles without errors. But the problem is there are too many errors for core.h file. Some errors;
Type 'std::experimental::basic_string_view<Char>' could not be resolved
Invalid overload of 'parse_format_specs'
Return has value, in function returning void
There are errors like these. The software compiles and runs, but there are errors in both main and library files. Likewise, I did the same compiling and installing to use the library named spdlog. It also compiles and works, but a lot of errors occur. Am I missing something in the cmake processes? There are always errors when I import an external library. How can I solve it?