Every now and again google webmaster tools reports this on one of both sitemaps of my website. Resubmitting seems to get rid of the message and give me the green tick and check each day im online and eventually one day it will be a red tick with the follwing message:
We encountered an error while trying to access your Sitemap. Please ensure your Sitemap follows our guidelines and can be accessed at the location you provided and then resubmit.
Nothing in as to what caused the error.
Is powwebs new caching thing of non html and php files causing this? or is something else up. My XML sitemaps validate on any validator ive been using.