NDK 코드 build 오류좀 봐주세요 ㅠ

Question

 Error:Execution failed for task ':tess-two:ndkBuild'.
> A problem occurred starting process 'command 'ndk-build.cmd'' 오류가 뜨면서 main엑티비티에 R에러가 뜨네요

NDK소스는 전혀볼줄몰라서 ㅠㅠ

tess-two 라는 OCR문자인식 소스이며 모듈 build.gradle 에서 난 에러입니다.  

여기서 에러가 나는거같은데 뭐가문제일까요

버전문제일수도 있는건가요

   // Call external ndk-build(.cmd) script to build the native code
    task ndkBuild(type: Exec) {
        def ndkBuildExt = Os.isFamily(Os.FAMILY_WINDOWS) ? ".cmd" : ""
        commandLine "ndk-build${ndkBuildExt}", '-C', file('.').absolutePath,
                '-j', Runtime.runtime.availableProcessors()
    }

    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn ndkBuild
    }

    // Cleanup task to remove previously generated binaries
    task ndkClean(type: Exec) {
        def ndkBuildExt = Os.isFamily(Os.FAMILY_WINDOWS) ? ".cmd" : ""
        commandLine "ndk-build${ndkBuildExt}", '-C', file('.').absolutePath, 'clean'
    }

    tasks.withType(Delete) {
        cleanTask -> cleanTask.dependsOn ndkClean
    }

}

아시는분 계시면 꼭좀 부탁드리겠습니다.