Help with compiling NDK files in CMD. An error pops up.

[KlizeYT]

C:\ndk25>ndk-build -C C:/jni
make: Entering directory 'C:/jni'
C:/ndk25/build/../build/core/build-all.mk:82: Android NDK: WARNING: No modules to build your APP_MODULES definition is probably incorrect!
make: Leaving directory 'C:/jni'
make: Entering directory 'C:/jni'
make: *** No rule to make target 'samp', needed by 'ndk-app-local'. Stop.
make: Leaving directory 'C:/jni'

Help, I've been trying to do something for 2 hours!

[KlizeYT]

C:\ndk25>ndk-build -C C:\jni
make: Entering directory 'C:/jni'
Android NDK: jni/Android.mk:sampvoice: LOCAL_MODULE_FILENAME should not include file extensions
Android NDK: jni/Android.mk:sampvoice: LOCAL_MODULE_FILENAME must not contain a file extension
C:/ndk25/build/../build/core/build-shared-library.mk:27: *** Android NDK: Aborting . Stop.
make: Leaving directory 'C:/jni'

Now this error.