Process finished with non-zero exit value 2

Hi everyone I'm trying import Jumble into my project but this error appears in gradle of Jumble when I'm trying to compile the app first my NDK version was 17 but I read somewhere this error occurs in version 17 so I'm trying version 16 but the error still remains

Process 'command 'C:\dev\ndk\android-ndk-r16b\ndk-build.cmd'' finished with non-zero exit value 2

and my ndkBuild is Jumble gradle is :

task ndkBuild(type: Exec) {
    commandLine project.android.ndkDirectory.absolutePath + '\\ndk-build.cmd', '-C', file('src/main/jni/').absolutePath
}

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

does anyone know how to fix this? any help will be much appreciated.