I recently added:
https://mods.factorio.com/mod/Fluidless_Mining_and_Ore_Washing
https://mods.factorio.com/mod/km_a10
https://mods.factorio.com/mod/kj_fuel

I suspect the ore washing one. Maybe the mod isn't able to create the memory unit for it?

Error occurs when I try to deconstruct.

"The mod Memory Storage (1.2.15) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event deep-storage-unit-se::on_pre_player_mined_item (ID 11)
deep-storage-unit-se/control.lua:194: attempt to index local 'unit_data' (a nil value)
stack traceback:
deep-storage-unit-se/control.lua:194: in function <deep-storage-unit-se/control.lua:189>"

I'm not sure mate. I haven't worked on these for ages.

I encountered some errors when making this, that meant that I had to use the console to delete objects that I had created that weren't fully populated.

I just found out it was not affecting only storages with the new mod item.
All storages from this mod are not working properly. My new guess is some incompatibility with an update of the dependencies.