Auto Mapper Build Option Disappeared

Hi there, After i unlocked enchanting auto mapper is also become avaible. However i did not have enough materials to complete the action that time so i started to gather resources to upgrade later. As you can see in the picture the build option for auto matter is disappared and I tried to relog , reboot etc no difference. Did I do something wrong or is it a bug? Thanks in advance

Well I still have this issue .. Help please..

Ok got it now.. Thanks