Google: Increase in server errors

I have been getting a few of the “Increase in server errors” emails from google lately and when i checked the crawl errors log in webmaster tools i saw that google trying to crawl the plugins and thats where it gets those errors from. Check this screenshot for the error messages: http://i.imgur.com/6wJngB1.jpg

is it possible to make google to NOT crawl the plugins section on my blog? so that google cannot find these “errors”. (note that all plugins works fine so i have no idea why google gets these errors when crawling the blog