Getting "Transaction failed"

the errors started happening when i bought the Mr. Holodilnick Thermal bag. i had no space at first, i moved items then bought it again and it said transaction error. i did a few times until i realized it used my money but didnt give me the item (i was also able to buy items from the flea market before lvl 20). now whenever i sell items, buy items, submit quest items, it says transaction error.

EDIT: SOMETIMES closing the server and launcher and restarting the game, SOMETIMES. not sure what happened but after restarting a few times it has corrected itself.