Dynmap freezes after installing Dynmap-GriefPrevention

I downloaded the plugin. Placed it in my plugins folder and installed it using Plugman. I reloaded Dynmap and then refreshed my page. So, I saw the 'GriefPrevention' marker but, there are no regions showing. I tried to navigate but, it froze.

I am using Dynmap v2.2-1118, GriefPrevention v13.6 and Dynmap-GriefPrevention v0.80, which I temporarily disabled. Please help, thanks!
