Guild Wars 2

for some reason i can’t access the trade post, not buying or selling and not gem store neither
when i enter i see gray screen and it says: ERROR invalid authorization.
that’s with all my characters, my friend could access his trade post
did anyone else got this?

hi guys
i’m new to the game, like 3 days ago
i have engineer lvl 20 and i can’t decide which build to go
i mostly want it for pve, i’m still learning the game

i saw some build suggestions and this i liked the most
http://www.gw2db.com/skill-builds/644-rifle-turrets-precision
i like the use of rifle, bombs, turrets
do you think that build will suit me well?
if not, which will you suggest?
i’m crafting rifles and pistols which state should i take with it, precision probably?

thanks for help