hm i look at your vid but i dont know what you are doing! normally you dont have to open the posidon exe! you dont need it!
second, i dont know if you are useing xkore or not! but in both ways you have to start openkore first before login in with you acc!
third, seen from distance, i whould the say the error is caused from an incorrect server config!
look in your server.txt and search for the vanro details! mine are this:
##
[Only registered and activated users can see links. Click Here To Register...]
[VanRO: Medium Rate Private Server]
ip 66.111.51.160
port 6800
master_version 20
version 18
serverType 4
clientSight 20
serverEncoding Western
##
[Only registered and activated users can see links. Click Here To Register...]
[VanRO: High Rate Private Server]
ip 74.52.137.116
port 6800
master_version 18
version 20
serverType 4
serverEncoding Western
check them and then try again! hope that helps! if not, just write here again! ;)
greetz Angel