Fluke 105b series II Setting

[Jmol]

Maybe a stupid question but still asking it anyway.
This fluke 105b was a gift from my grandfather and now that I want to use it, I don't get a reading out of it.
I want to use the multimeter section, so I'm using the ext. probes

But as soon as I put my probes in the Walloutlet I get a OL reading in the display on but Vrms  AC aswell is OL Vrms DC
I can see from the graph that the fluke is actually reading the voltage of my outlet but it is not showing any numbers, just OL.

Does someone know what I'm doing wrong?