Unlocking the Rocket Silo requires throwing away 1000 Biorecycling tech cards, but crafting those cards from biorecycling research data requires the Research Server from K2SO. The Research Server cannot be crafted on Rubia because it requires electronic components, and those can’t be made there due to the lack of stone/plastic.
UPD: i also have xyrc's K2SO Enhancements mod installed

Rubia has its own compat with K2SO, which makes them work together perfectly.

xyrc’s K2SO Enhancements introduces this softlock by explicitly changing biorecycling science packs to tech cards for the case where Rubia and K2SO are installed at the same time.

It is therefore xyrc’s responsibility to make sure that his mod does not introduce a softlock when it edits Rubia’s science. Sorry, but I will not be patching Rubia to fix that mod’s issue. Please go to xyrc’s mod forum thread on this topic.