Default Trying to install new rom and I get an error

Im using Philz recovery and I have been installing new roms just fine. I wanted to format my internal storage cause the new rom required it. and now when I go to install a new rom it says E:Cannont write to /sdcard/clockworkmod/ .last_install_path. How can I fix this?
Sounds great but...

The major drawback of that route is that you will not be able to receive phone calls or text messages.
Am I missing something or does this make your phone fairly useless? 0_o.