There was an error while I tried updating or creating the google-news-sitemap.xml. Seems the file is not writable. Please chmod the file so the webserver can write to the file (i.e. 644)
Have tried the file permission but error continues. Would appreciate it if you have any suggestion. Thanks.
never mind - solved the problem: google-news-sitemap.xml must be located in the root directory. chmod 644 is not sufficient, it has to be 777.