It seems that a CGI application installed on your server is not set up correctly (I'm guessing PHP5?, but it could be any number of applications). This is an issue with how your webhost has installed a certain application on the server, not an issue with Plogger coding.
Is that the whole error? If it lists a specific application, you should contact your webhost and have them set up the application correctly. btw, what webhost are you using?