Created attachment 605524 [details]
screenshot of the error

Description of problem:

When testing F18 tc3, if i enter "network configuration" and exit (nothing was 
changed), anaconda emits: "an unknown error has occurred" -> ""
Version-Release number of selected component (if applicable):

Due to using a kvm guest and i could not launch a terminal from the anaconda-ui, no logs for now. But i will attach some screenshots.

How reproducible:
allways. 


Steps to Reproduce:
1. boot 
2. enter network configuration
3. exit
  
Actual results:
anaconda restarts the system

Expected results:
no error

Additional info:
i happened also with prior anaconda test images.