Error : While building this project in Android Studio

[hammadbawara]

[CXX1405] error when building with ndkBuild using C:\Users\hamma\AndroidStudioProjects\PDF Libraries Testing\mupdf-android-viewer\jni\libmupdf\platform\java\Android.mk: Build command failed.
Error while executing process C:\Users\hamma\AppData\Local\Android\Sdk\ndk\21.4.7075529\ndk-build.cmd with arguments {NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=C:\Users\hamma\AndroidStudioProjects\PDF Libraries Testing\mupdf-android-viewer\jni\libmupdf\platform\java\Android.mk NDK_APPLICATION_MK=C:\Users\hamma\AndroidStudioProjects\PDF Libraries Testing\mupdf-android-viewer\jni\libmupdf\platform\java\Application.mk APP_ABI=x86_64 NDK_ALL_ABIS=x86_64 NDK_DEBUG=1 APP_PLATFORM=android-21 NDK_OUT=C:\Users\hamma\AndroidStudioProjects\PDF Libraries Testing\mupdf-android-viewer\jni\build\intermediates\cxx\Debug\5xg4w416/obj NDK_LIBS_OUT=C:\Users\hamma\AndroidStudioProjects\PDF Libraries Testing\mupdf-android-viewer\jni\build\intermediates\cxx\Debug\5xg4w416/lib -j4 APP_SHORT_COMMANDS=false LOCAL_SHORT_COMMANDS=false -B -n}
Android NDK: Your APP_BUILD_SCRIPT points to an unknown file: C:\Users\hamma\AndroidStudioProjects\PDF Libraries Testing\mupdf-android-viewer\jni\libmupdf\platform\java\Android.mk    

C:/Users/hamma/AppData/Local/Android/Sdk/ndk/21.4.7075529/build//../build/core/add-application.mk:88: *** Android NDK: Aborting...    .  Stop.