Error when installing avast anti-theft.

[xperias]

Hi, I uninstalled avast mobile security and anti-theft as I had forgot my password to access it and it got rid of the password protection. But, when I'm installing anti-theft again, it gives this error message:

Could not write to /system directory(mount: Invalid argumentcannot create /system/app/com.avast.android.antitheft.apk:read-only file systemUnable to chmod /system/app/com.avast.android.antitheft.apk: No such file or directory). Retry (it is recommended to retry at least one time)?

This is on a sony xperia s, firmware 6.0.A.3.73

[Filip Havlicek]

Hi,

is your device rooted? Was the AT installation you got rid of rooted? Are you trying to install AT rooted?

Filip

[xperias]

Hi,

is your device rooted? Was the AT installation you got rid of rooted? Are you trying to install AT rooted?

Filip

Yes, my device is rooted. The AT installation that I got rid of is rooted. Yes, I'm trying to install AT rooted.

Appreciate your help.

[xperias]

Wait, I rebooted my phone and the installation worked! 
Problem solved.

[Filip Havlicek]

OK, great

Filip