Basic Lab Missing

[pete1969]

Running a lot of mods but I'm a year in and have come up against a problem.
I have to build a PY electrolyzer to make a niobium plate. I cannot because the basic lab is missing from the build list, It is in the recipe list but greyed out.
I have searched everywhere but I'm stuck at a point where I cannot get any further. I'm running lots of mods and need help to advance!

[Pridesfall]

We probably need a list of your mods to start.

[DarkShadow44]

Uploading a save wold be easiest

[Zyz]

Are you sure it isn't related to yellow belts? When rubber is researched, the auto build uses the recipe requiring rubber to make belts. If you want to use the original recipe (not requiring rubber), you have to either hand craft it or use assemblers first, in order to have some in your inventory. Once you have the required amount of yellow belts in your inventory to build a lab, it shouldn't be grayed out anymore.