When the Oil-Derrick finishes "scouting" the bitumen seep the following message appears:

The mod Pyanodons Petroleum Handling (1.9.7) caused a non-recoverable error.
Please report this to the mod author.

Error while running event pypetroleumhandling::on_resource:depleted (ID 25)
Unknown entity name: oil-mk01
stack traceback:
pypetroleumhandling/control.lua:499 in function
<pypetroleumhandling/control.lua:468>
stack traceback:
[C]: in function 'create_entity'
pypetroleumhandling/control.lua:499 in function
<pypetroleumhandling/control.lua:468>

Thsi crashes the game/server

What all mods are you using. Please send in a save so I can debug this.

We are using all Pyanodons mods except PyVeganism. We also use PyCoalTBaA 1.0.0 so that we can use Omnimatter. The rest is QoL Mods like Far Reach and stuff.

You can Download my safe here: https://www.dropbox.com/s/0g221pk00ghy7nz/Pyanodon%20Server.zip?dl=0

Hope this helps and thanks for the fast response :)

Alright. Thanks going to sleep soon so I'll look at this later today and get it fixed.

ok so ive looked into it and it appears to be an issue with omni matter as it looks like they removed the oil resource but didnt remove the bitumen seeps.

Ok, thanks for your work :) I posted a Bug report on the Omnimatter Discord for it

i also spoke with one of the omni devs and they are aware of the issue now.