Now I have to work with the site with the WP plugin, but an error 500 appeared from time to time. What can cause a WordPress Site to give an HTTP 500 error? My colleague says she has the same problem. I don't know exactly, but I think our readers and other Internet users don't have access to the site too. What should I check? Please help me to find the solution to this problem, it's very important for us. Thanks!