Titanex, you may be using an out of date version of the plugin.
If you look at WebStats.cs, you can see that it's trying to download SharpSvn.dll from
http://just4dns.co.uk/svn/BuddyStats/trunk/. However, if you attempt to go there, you will receive a 404 Not Found error. In fact, this domain appears to be largely unused. Likely as much there's a newer version floating around with an updated URL; however, it looks like (at least this version) attempts to download the newest version of BuddyStats every time it starts, so there's no way to either manually download it and install sharpsvn.dll yourself. As well, all the pertinent c# files needed to make it run are also in the same Try block where it's going to download the dll, and all from the same location. In other words, if it can't download any one of, none of them will.