Spawn failed for named servers

I have setup zero-to-jupyterhub deployment on kubernetes.
(image1, image2, image3)

(See the 1st image for my config file)

Now when I open my control panel a try to start a named server, its spawn fails, I have my pod running on one of my 3 fixed nodes having the following resources: 1.8 cores of allocatable CPU and 3.1 GB allocatable RAM. And it can autoscale to 5 nodes (other nodes will also have the same resources).

Named servers I have:
(see the 2nd image)
Now when I start named server 1: The spawn for the server fails. (see the 3rd image)

Then the spawn for server 1 fails. You can see the event log in the image.