If you are experiencing an error in Washington, it's possible that the State system built by MJFreeway is down or slower than usual. Please click this link to see if LEAF is down.
If they are down, please reach out to the LCB and let them know, just in case they don't already know about the issue!!
Usually, they fix these things pretty quick so you can most likely try again in a few minutes.
When you receive an error like this, it's best to refresh your screen prior to trying again as its possible that what you were doing before actually worked or partially worked, and refreshing your screen will reduce the chance of creating duplicate items.