Android NDK Compile error NDK_PROJECT_PATH=null
Your build (gradle ?) is not passing proper path to the root of your project to ndk-build.cmd.
You can run the ndk-build.cmd from command line. Open a command prompt, cd into your module folder (it should have jni folder) , and run c:\ndk\ndk-build.cmd it will use the current path as the NDK_PROJECT_PATH