WP-PostRatings 1.40

Hi all …

when i press Update ‘Individual Rating Text/Value’ Display
on control panel of the plugin (Ratings –> Ratings Options)
i obtain this:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.

This is the log:
[Tue Jun 02 08:04:55 2009] [error] [client 151.56.180.126] suexec policy violation: see suexec log for more details, referer: http://www.madeinsicily.net/wp/wp-admin/admin.php?page=wp-postratings/postratings-options.php
[Tue Jun 02 08:04:55 2009] [error] [client 151.56.180.126] Premature end of script headers: postratings-admin-ajax.php, referer: http://www.madeinsicily.net/wp/wp-admin/admin.php?page=wp-postratings/postratings-options.php

I use only
WordPress 2.7.1 (italian) on http://www.madeinsicily.net/wp
WP-PostRatings 1.40 (not traslated) on http://www.madeinsicily.net/wp/wp-content/plugins/wp-postratings (Folders 0755 – Files 0644)
My site is on Aruba.it Hosting Linux with PHP 5.2.9 and MySQL 5.0.68

I have insert the code
‘<?php if(function_exists(‘the_ratings’)) { the_ratings(); } ?>’
on the loop of the single.php of the WordPress Default Theme
but when i vote it don’t go !