How can I solve " source file not found" problem?

See more:

Dart

Flutter

I am trying to call a native C function from Dart. I have made my C files, CMakeLists.txt and required Dart file. but when I run my code it shows:

Execution failed for task ':flutter_plugin3:generateJsonModelDebug'.
> C:\Users\Mubin\AndroidStudioProjects\flutter_plugin3\android\CMakeLists.txt : C/C++ debug|armeabi-v7a : CMake Error at C:\Users\Mubin\AndroidStudioProjects\flutter_plugin3\android\CMakeLists.txt:3 (add_library):
    Cannot find source file:

      hello.c

    Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
    .hxx .in .txx


* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

"


re.png - Google Drive[^]

What I have tried:

My CMakeLists:

cmake_minimum_required(VERSION 3.7 FATAL_ERROR)
project(hello_library VERSION 1.0.0 LANGUAGES C)
add_library(hello_library SHARED hello.c hello.def)
add_executable(hello_test hello.c)

set_target_properties(hello_library PROPERTIES
    PUBLIC_HEADER hello.h
    VERSION ${PROJECT_VERSION}
    SOVERSION 1
    OUTPUT_NAME "hello"
    XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "Hex_Identity_ID_Goes_Here"
)

Dart code:

import 'dart:ffi' as ffi;
import 'dart:io' show Platform, Directory;
import 'package:path/path.dart' as path;
// For Platform.isX
import 'dart:async';

import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';

class FlutterPlugin3 {
  static const MethodChannel _channel =
      const MethodChannel('flutter_plugin3');

  static Future<String> get platformVersion async {
    final String version = await _channel.invokeMethod('getPlatformVersion');
    return version;
  }
}


  // Open the dynamic library
typedef hello_world_func = ffi.Void Function();
// Dart type definition for calling the C foreign function
typedef HelloWorld = void Function();



 greet() {
   // Open the dynamic library
   var libraryPath = path.join(Directory.current.path, 'hello_library',
       'libhello.so');
   if (Platform.isMacOS) {
     libraryPath = path.join(Directory.current.path, 'hello_library',
         'libhello.dylib');
   } else if (Platform.isWindows) {
     libraryPath = path.join(Directory.current.path, 'hello_library',
         'Debug', 'hello.dll');
   }

   final dylib = ffi.DynamicLibrary.open(libraryPath);

   // Look up the C function 'hello_world'
   final HelloWorld hello = dylib
       .lookup<ffi.NativeFunction<hello_world_func>>('hello_world')
       .asFunction();


   // Call the function
   hello();
 }