Hi, I cannot barter with barterer on entry level. I have required goods in my boat inventory. There is exchange availability listed and remaining number is 1. My boat is close to barterer. But when I interact with him I get "not enough knowledge". This in on Randis Island white grade barter. What should I do to gain this knowledge - there is no info in path notes about any requiement - it's stated as everyone can barter. I'm so confused... Please help.