I got the below error on my old account when i tried renting an iron set
and after the rental i could not re equip my old iron set and got the
So i created another account and was playing but now i am getting the same error for the new account also
It seems you are posting from your old account. Although you created a new account but are now back using your old account (unless the account you used to post here is an "old old" account (which would make it 2 olds), before the "old" account).
Considering you received the same error message on both accounts, it seems unrelated unless you also rented clubs on the new account.
If you have a third account, try renting from that account and see if you get the same error.
I am not sure what the error you got on your old account, but it appears, now, at least to me, perhaps you have one account too many. That may account for the problems you have with your accounts.