Thanks Mark!
You're using a field for a port (or service), not for an IP.
In that field you could put a port as '22' for ssh, or you could put 'ssh' 
(it's the same), but you can't use an IP.
If you want allow/block an IP you must use the 3th tab: Advanced ;)
You have here the official documentation:
https://help.ubuntu.com/community/Gufw#Adding_Rules
Best regards :)

** Changed in: gui-ufw
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1080044

Title:
  Error when adding rule

Status in Gufw:
  Invalid

Bug description:
  Gufw 12.04.1

  When adding a new rule in GUFW it is now showing up in the rules list.
  Bottom of GUI shows: "Error performing operation".

  The added rule is not shown but also not active.
  How to solve this? Manual configuration?

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