chinese Buildings problems!

Sorry, I can't speak german so I will write it in english.
I install the I.A.A.M. 1404 Version 3.2 and I like the chinese buildings ,

and I meet all their needs,but I can't upgrade my farmers to next level 。
please tell me how to upgrade them, thank you !

really，oh，it‘s a bad news. OK, I will wait for next mod. I hope the next mod may solve this problem.