A system error occurred during event movement.

Time: 14:10
Frequency: Very Frequent; 4 attempts
World name: Leviathan
Character name: Raaran Schwerkraft
NPC name: K'lyhia
Monster name: N/A
Class/Level: ACN18
Party or solo: Solo
In-game time: about 5:45 ET
Area and coordinates: Middle La Noscea
Steps:
1. Clicking NPC to initiate next part of quest 'tactical Planning'
2. Asks if want to proceed + clicked proceed
3. All interaction are frozen for approx 2 minutes
4. "A system error occurred during event movement." in chat and NPC is deselected automatically.

In one case the loading screen continued for several minutes without an error. Had to force disconnect and log in again.