The WoW Token allows players to purchase World of Warcraft game time for real money and then sell that game time for gold on the in-game auction house.
This error may be due to a server problem.
Parental controls may prevent purchases on your account.
Information on error BLZ51900011
Troubleshooting chat problems in World of Warcraft
Eligibility and limitations to consider when a free character transfer is available
List of limitations to buying a WoW Token