VS Code can't find header files In Linux VSCode

My workspace is :

├── README.md└── sim├── Makefile├── include│├── add.cpp│└── add.h│└── src└── main.cpp

My main.cpp is :

// main.cpp#include <iostream>#include "Add.h"using namespace std;int main(){    int a = 10;    int b = 20;    int c;    c = add(a, b);    cout << a << " +" << b << " = " << c << endl;    return 0;}

My add.h is:

// Add.h#include <iostream>#include "main.cpp"using namespace std;int add(int a, int b);

My add.cpp is:

//add.cpp#include <iostream>#include "Add.h"using namespace std;int add(int a, int b){    return a + b;}

My c_cpp_properties.json is:

{"configurations": [        {"name": "Linux","includePath": ["${workspaceFolder}/**","${workspaceFolder}/sim/include/**"            ],"defines": [],"compilerPath": "/usr/bin/gcc","cStandard": "c17","cppStandard": "gnu++17","intelliSenseMode": "linux-gcc-x64"        }    ],"version": 4}

My launch.json is:

{"version": "0.2.0","configurations": [        {"miDebuggerArgs": "-q -ex quit; wait() { fg >/dev/null; }; /bin/gdb -q --interpreter=mi","name": "C/C++","type": "cppdbg","request": "launch","program": "${fileDirname}/${fileBasenameNoExtension}","args": [],"stopAtEntry": false,"cwd": "${workspaceFolder}","environment": [],"externalConsole": false,"MIMode": "gdb","preLaunchTask": "compile","setupCommands": [                {"description": "Enable pretty-printing for gdb","text": "-enable-pretty-printing","ignoreFailures": true                }            ]        }    ]}

My tasks.json is:

{"version": "2.0.0","tasks": [        {"label": "compile","command": "g++","args": ["-g","${file}","-o","${fileDirname}/${fileBasenameNoExtension}","-I${workspaceFolder}/sim/include/**"            ],"problemMatcher": {"owner": "cpp","fileLocation": ["relative","${workspaceRoot}"                ],"pattern": {"regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$","file": 1,"line": 2,"column": 3,"severity": 4,"message": 5                }            },"group": {"kind": "build","isDefault": true            }        }    ]}

And I encountered an error when I pressed F5 in main.cpp :

enter image description here

 *  Executing task: g++ -g /home/chris/Code/graduation-project/sim/src/main.cpp -o /home/chris/Code/graduation-project/sim/src/main -I/home/chris/Code/graduation-project/sim/include/** /home/chris/Code/graduation-project/sim/src/main.cpp:3:10: fatal error: Add.h: No such file or directory    3 | #include "Add.h"      |          ^~~~~~~compilation terminated. *  The terminal process "g++'-g', '/home/chris/Code/graduation-project/sim/src/main.cpp', '-o', '/home/chris/Code/graduation-project/sim/src/main', '-I/home/chris/Code/graduation-project/sim/include/**'" failed to launch (exit code: 1).  *  Terminal will be reused by tasks, press any key to close it. 

What should I do ?

How can I get my main.cpp and its header files to work together when they are in different folders? I am using Ubuntu 22.04 under WSL2 and connecting remotely via VSCode.