https://mods.factorio.com/mod/omnimatter_fluid causes a conflict with this mod.

Can you provide more details? Or at least confirm that you were also using Cybersyn? I'm not seeing any errors with just omnimatter_fluid and pysimple alone but I think I've isolated the issue and want to be sure it's fixed before publishing an update.

Failed to load mods: Error while loading recipe prototype "basic-oil-processing" (recipe): Recipe has invalid main product petroleum-gas. The product does not exist in the recipe product list.
Modifications: Base mod › Quality › Pyanodons Coal Processing › Pyanodons Post Processing › Omnifluid › Pyanodons Simplified

I got the above error. When I disabled at least one of this mod or omniluid, this error stopped occurring. And I am using cybersyn.

Thanks. This is fixed in the most recent version.