i cannot spend any books on skill of explorer and geologist?

[queenquak]

i dont know why i am not able to spend any books on skills of my explorer and geologist... it says that you require 5 books in lower levels and i have almost 9 books .... plz help me

[Durin_d]

Have you spent the max amount of books per expert already? Geo 31 and Explorer 21

[Thejollyone]

have you spent the minimum manuscripts first on the lower levels?

[MOD_Daz]

It's times like this that a screenshot would be helpful