Database VBA Autofilter Issue

Afternoon folks,

I'm working on a database just now, well when I say working I mean I've copied one and changing to what what I need. It's one from the good old RoyUK (who has been really helpful in the past)

Started off Ok, and still a lot to do. But found a wee problem which I cannot work out how to fix. Everthing works fine, but when I start the application, and change information and press the ammend button, I'm getting an error, and cannot see anything wrong ?

I've attached example.