ar: no archive members specified while building project with Cmake

[aggnostos]

I'm trying to build my project with Cmake but getting the following error:

[main] Building folder: passman 
[build] Starting build
[proc] Executing command: /opt/homebrew/bin/cmake --build /Users/user/Desktop/cpp/projects/passman/build --config Debug --target main --
[build] [1/2  50% :: 0.019] Linking CXX static library include/argon2/libargon2.a
[build] FAILED: include/argon2/libargon2.a 
[build] : && /opt/homebrew/Cellar/cmake/3.24.2/bin/cmake -E rm -f include/argon2/libargon2.a && /usr/bin/ar qc include/argon2/libargon2.a   && /usr/bin/ranlib include/argon2/libargon2.a && /opt/homebrew/Cellar/cmake/3.24.2/bin/cmake -E touch include/argon2/libargon2.a && :
[build] ar: no archive members specified
[build] usage:  ar -d [-TLsv] archive file ...
[build]     ar -m [-TLsv] archive file ...
[build]     ar -m [-abiTLsv] position archive file ...
[build]     ar -p [-TLsv] archive [file ...]
[build]     ar -q [-cTLsv] archive file ...
[build]     ar -r [-cuTLsv] archive file ...
[build]     ar -r [-abciuTLsv] position archive file ...
[build]     ar -t [-TLsv] archive [file ...]
[build]     ar -x [-ouTLsv] archive [file ...]
[build] ninja: build stopped: subcommand failed.
[proc] The command: /opt/homebrew/bin/cmake --build /Users/user/Desktop/cpp/projects/passman/build --config Debug --target main -- exited with code: 1
[driver] Build completed: 00:00:00.030
[build] Build finished with exit code 1

Here's a project structure:

├── CMakeLists.txt
├── build
    ...
├── include
 │  ├── argon2
 │   │   ├── CMakeLists.txt
 │   │   ├── argon2.h
 │   │   └── libargon2.a
└── src
    ├── CMakeLists.txt
    ├── main.cpp
    ├── passman.cpp
    └── passman.hpp

CmakeLists.txt inside incude/argon2:

cmake_minimum_required(VERSION 3.0.0)
project(argon2 LANGUAGES CXX)

add_library(argon2 STATIC argon2.h)
target_include_directories(argon2 PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/>)
set_target_properties(argon2 PROPERTIES CXX_STANDARD 20 CXX_STANDARD_REQUIRED ON)
set_target_properties(argon2 PROPERTIES LINKER_LANGUAGE CXX)
add_library(argon2::argon2 ALIAS argon2)

CmakeLists.txt inside src:

cmake_minimum_required(VERSION 3.0.0)

add_executable(main main.cpp passman.cpp)

target_link_libraries(main PRIVATE argon2)

CmakeLists.txt inside root directory of the project:

cmake_minimum_required(VERSION 3.0.0)

project(PassMan CXX)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20")

include(CTest)
include(CPack)

enable_testing()

add_subdirectory(include/argon2)
add_subdirectory(src)