CNN —

Remember when "Dawson's Creek" replaced its theme song with another one? Well, now they are having to employ an understudy for one of its stars for a special event.

James Van Der Beek, who played Dawson Leery on the hit teen drama which ran from 1998 to 2003, has announced that he won't be able to participate in their planned "class reunion" due to illness.

"This is the evening I'd been looking forward to MOST since my angel Michelle Williams said she was putting it together, way back in January…," Van Der Beek wrote on his verified Instagram. "So you can imagine how gutted I was when two stomach viruses conspired to knock me out of commission and keep me grounded at the worst possible moment."

Multiple co-stars, including Michelle Williams, Katie Holmes and Joshua Jackson, are

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