How to build a stone mine VI

[Nserk]

Hi to all!

I have a problem (i don't know if it's a bug or my fault): i have already researched the "Automated stone mining", but there's no option to building it in the build section; there are the IV and V versions, but no the VI one.

I miss something?

Thanks in advance.

[Clawdius Talonious]

It sounds like you may need to research the next bench/level of research in order to be able to research stone mine VI.

[Nserk]

Thank you! It worked.