I discovered this game today, but this error made the game crash at the splash image of Java.
Here is the solution i've found, hope it will help you guys.
Step 1: When you click on the PLAY button , save haven's jnlp file somewhere (for example: c:\autohaven.jnlp)
Step 2: Create a shortcut on the desktop. (Be careful to the quotation marks " ", place exactly as i placed)
type for the shortcut destination:
"C:\Program Files\Java\jre6\bin\javaws.exe" -Xnosplash C:\autohaven.jnlp
Then java will run the game without Splash and the error solved.
I also heard some issue with comodo firewall that blocks java's splash thing...
Hope it helped you guys
Yynn
