Help getting Galaxy S6 and GearVR to work

Hi guys…

Im trying to just follow the online info to build first apk but keeps failing. Im including output log

Here is the error:

Error: Target id ‘android-24’ is not valid. Use ‘android.bat list targets’ to get the target ids.

You set android-24 for SDK version without first installing android-24 SDK with SDK Manager.exe in NVPack/android-sdk-windows. It isn’t installed by default.