Fatal error in K2.php / Please help

realizing this is an open forum… and not in the spirit of a paid service, i am getting desperate at this point and willing to pay a small sum for somebody that can help get my blog back to working order… as i have not received any responses on the forum.

basically, the blog out of nowhere was loading without a visual template (k2 with a vader style)… just photos on white back ground with the blog entries. i checked the header file as suggested and it was full of spam strangely. so i stupidly tried to replace the header file with a new header from the k2 folder… and now i can’t even get into admin controls and it gives me the error as you can see when you goto the page.

any help is much appreciated.

https://www.ragrobot.net