Not sure but you can try
\src\map\script.cpp >> lines 11187. (Copy/Look at this line of code)
Then go to channel src files.
Try to check it's trade channel and announce it.
Are you using git programs to download rAthena? If yes just press fetch & pull then see the conflict and solve them.
If not you need to manualy update it.
My friends found the same issue, He used the same server & client from me and it's pop error when try to create characters.
Maybe problems came from Windows, Runtimes, Drivers, etc. I don't know.
There will be some error pop up on patching. Please ignore that and try not to use them.
The best way is use stable client like 20180620 for multiple choice to patch.
\conf\battle\player.conf
min_npc_vendchat_distance:
This can be used to block when players want to vending near NPC.
and setcell you can see example scripts in doc>script_command.