Permissions problem, help!

I’m getting this error message:

Warning: require(/home/mightyma/public_html/juice-acai-com/wp-includes/compat.php) [function.require]: failed to open stream: Permission denied in /home/mightyma/public_html/juice-acai-com/wp-settings.php on line 246

Fatal error: require() [function.require]: Failed opening required ‘/home/mightyma/public_html/juice-acai-com/wp-includes/compat.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/mightyma/public_html/juice-acai-com/wp-settings.php on line 246