v1.5.7 will not work; says it requires root access.

```
What steps will reproduce the problem?
1. Enable firewall.
2.
3.

What is the expected output? What do you see instead?
Receive the following msg: "Could not acquire root access. You need a rooted
phone to run DroidWall."
Error msg: "java.io.IOException:Error running exec ()..... "

What version of the product are you using? On what operating system?
v1.5.7
on Galaxy Skyrocket (i727) upgraded from gingerbread to ics.

Please provide any additional information below.
I followed the directions on your site to use v1.5.7 because my phone is not
rooted, but still says it requires a rooted phone to work.

```

Original issue reported on code.google.com by `MWBarn...@gmail.com` on 16 Jul 2012 at 5:25