pm setInstallLocation 2 error

[tryingtolearn]

Hello everyone,
I have a rooted samsung precedent. I'm trying to set the default location for apps to the sd card but I cant use adb devices to do so because my phone is dying and wont connect to pc.
I want to use cmd prompt but when I type pm setInstallLocation 2 I get

rename(/data/anr/traces.txt /data/anr/traces.txt.anr) permission denied

If I try su pm setInstallLocation 2 I get su help

If I try su pm I get pm help

Please can someone help with syntax or advice?
Thanx

 

[tryingtolearn]

I found an app "move2sd enabler" sets it for you. I had to google search it for it to show in playstore.
Still would love to know why su pm setInstallLocation 2 doesnt work...