Default [Q] Scripts Not Running ,Why ?

My Moto g Phone is Rooted with stock ROM. I used method for mounting OTG USB drive folders and linking them to phone which required GScript-Lite.

But mount -o bind /storage/usbdrive/...... /sdcard/Android/obb ..... something like that (I am confirming it is typed correctly ).

Gscript-lite gives me error - cannot mount (access denied or something like that). i looked if it worked after ignoring error also , but it didn't worked.

tried other script apps and others say path does not exist. ? what to do ? is gscript-lite not getting permission or rights from root ?