TimeStamp not working

Hi,
I have butchered a tracker that wasn't mine to get a TimeStamp but it isn't working on my tracker. The person that wrote the original tracker isn't available to ask and I can't follow the code to work out what is wrong.
Originally the location of the time was on the same worksheet that the timestamp was being inserted, I have moved it to a worksheet called 'Validation' which is normally hidden (I have tried it with the sheet visible but still not working).

I have attached a copy of the tracker.

Thanking you all in advance.

When I use the shortcut CTRL+t it should paste the time into the cell. The time is pulled form G2 on the Validation worksheet. Instead I get a Run-time error '91' message.... "Object variable or With block variable not set".
I am not aware of anything changing when I copied it and I don't know enough to be able to work out what it is doing to fix it.

Apologies to all, I uploaded the incorrect document. Pleae find attached the correct document attached below.