After deactivating W3 Total Cache my blog is running good but still it is creating log file with the error I have listed above.
Yes Ads are showing perfectly on Firefox and Google Chrome but not on IE. I am using Windows XP with IE 8.
I am also facing same problem from last 2 days. I don’t know what can be the reason. I have 4 blogs and all have different theme.
I think after upgrading to WordPress 2.8.5 this problem start occurring but one of my blog is displaying all ads correctly but not on other 3.