This is a common error shown on WordPress after moving the wordpress from one server to another:
file_exists() [function.file-exists]: open_basedir restriction in effect.
Its due to changed of the absolute path, you will need to change the upload_path option in wordpress database:
1. Login to phpmyadmin which would normally located at http://yourdomain.com/phpmyadmin with your database username and password. You can get this by checking on the wp-config.php file
2. After login to phpmyadmin, click on the wp_options table:
3. Look for the column name upload_path, edit it with the new path in your new hosting server, you can get this by checking in the file manager or FTP:
4. refresh you page and the open_basedir warning will be resolved.