We have investigated this issue and have implemented a hotfix to resolve. The issue may persist until realms are restarted. If the issue persists after your region's realms are restarted, please submit a Bug Report.
Information about a bug which could cause you to be out of sync with your outpost and quests in Gorgrond after using party sync with friends
Information on locating Lizzarik to turn in "Venture Co. Business Plan" quest
Troubleshooting steps for what to do if you get this error when trying to make a purchase.