I hate rooting and doing all this, and have never tried on my galaxy ace (will probably never), it can harm your precious phone (as it states this) and even brick it!!

 

Try flashing a fresh official firmware using Odin.
Get firmwares from sammobile.com, flash the one from your region only.

The rom you were flashing must have had a bad updater script, it didn't flash completely. And this rom is not android 4.0.3, its only themed like that, it is basically gingerbread.
You should read more before attempting to flash custom roms.

 

Same problem here. Any solution yet?

 

You can download the latest version and try again, follow the installation instructions.

If you are still having this problem you can contact the developers and report this issue, i am sure they'll be happy to solve this.

The Myth Ace - ♫ Home

 

The myth is not ics. Its gingerbread with the ics theme amd its build.prop file edited to say 4.0.3. Were you trying to flash it with odin? Or clockworkmod recovery?