If you are using Erendora files then go to script/worldserver.ini and find TRADECONT 1
Code:
ResourceFolder ""
Key 0101
Core "127.0.0.1"
DB "127.0.0.1"
Account "127.0.0.1"
LANG 1
Heartbeat 10101
Proc 2
GUILDWAR
NO_TRADE
[COLOR=#ff0000]//TRADECONT 1 <~ it should like this to enable vending on flaris[/COLOR]
18
PK
PKCOST
STEAL
DROPITEM_REMOVE
AUCTIONHOUSE
WORMON
GUILDBANK
GUILDCOMBAT
GUILDCOMBAT1TO1
ARENA
SECRETROOM
RAINBOWRACE
RECOMMEND