You are using
adb sideload to communicate with your Android device (e.g. to flash the Nexus 4 using Clockworkmod recovery), but every time you try to execute `adb sideload` you get this error message:
As the error message isn’t really specific, there might be numerous possible reasons for it. For me (on Ubuntu 12.10), this worked:
As the same user that executes
adb sideload, run
After that you should be able to use sideload without any error.