DSG driving me crazy

[wally2]

Hi guys, i was working on a faulty front light globe yesterday and disconnected the battery.
This morning going to go to work i found the car will start but wont engage gears. The level moves up and down and the display light comes on the gear selector but nothing. The car just revs like it ins neutral, in any gear.
Had top get a uber to work!

Also there is a spanner flashing on the dash where the gear display is.

Anyone have a clue whats going on here and can offer some advice.

Thanks for any help.

Wally